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Long-Term Debt - Additional Information (Detail) (USD $)
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9 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended | 9 Months Ended | 0 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | ||||||||||||||||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 14, 2012
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Jul. 30, 2013
Unsecured Debt [Member]
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Dec. 14, 2012
Secured Debt [Member]
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Sep. 30, 2013
Secured Debt [Member]
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Sep. 30, 2013
Revolving Credit Facility [Member]
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Dec. 31, 2012
Revolving Credit Facility [Member]
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Sep. 30, 2013
9.125% Senior Notes, due April 2018 [Member]
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Dec. 31, 2012
9.125% Senior Notes, due April 2018 [Member]
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Mar. 22, 2010
9.125% Senior Notes, due April 2018 [Member]
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Sep. 30, 2013
7.50% Senior Notes, due August 2020 [Member]
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Jul. 30, 2013
7.50% Senior Notes, due August 2020 [Member]
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Dec. 31, 2012
7.50% Senior Notes, due August 2020 [Member]
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Mar. 22, 2010
9.625% Senior Notes due 2013 [Member]
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Sep. 30, 2013
9.625% Senior Notes due 2013 [Member]
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Mar. 22, 2010
Senior secured revolving credit facility (Revolver) [Member]
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Apr. 30, 2012
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
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Sep. 30, 2013
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
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Apr. 25, 2012
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
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May 09, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
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May 09, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
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Apr. 25, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
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Jul. 15, 2012
2.125% Convertible Senior Notes, due July 2012 [Member]
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Sep. 30, 2013
Term Note [Member]
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Dec. 14, 2012
Term Note [Member]
Secured Debt [Member]
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Sep. 30, 2013
Term Note Due December 2017 [Member]
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Dec. 31, 2012
Term Note Due December 2017 [Member]
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Dec. 14, 2012
Term Note Due December 2017 [Member]
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Apr. 18, 2013
Secured Debt [Member]
Goldman Term Loan [Member]
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Apr. 18, 2013
ITS [Member]
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Sep. 30, 2013
ITS [Member]
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Sep. 30, 2013
ITS [Member]
Term Note Due April 2018 [Member]
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Jul. 30, 2013
ITS [Member]
Term Note Due April 2018 [Member]
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Jul. 19, 2013
Subsequent Event [Member]
Unsecured Debt [Member]
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Jul. 30, 2013
Subsequent Event [Member]
7.50% Senior Notes, due August 2020 [Member]
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| Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||||||||
| Aggregate principal amount | $ 300,000,000.0 | $ 225,000,000.0 | $ 125,000,000.0 | $ 125,000,000 | |||||||||||||||||||||||||||||||||
| Percentage of notes guaranteed by restricted subsidiaries | 9.125% | 9.125% | 7.50% | 7.50% | 7.50% | 9.625% | 2.125% | 2.125% | 7.50% | ||||||||||||||||||||||||||||
| Increase in the amount of term loan or revolving credit facility | 45,000,000 | 50,000,000 | |||||||||||||||||||||||||||||||||||
| Deferred acquisition costs | 5,200,000 | 5,300,000 | |||||||||||||||||||||||||||||||||||
| Redemption amount percentage of principal | 35.00% | ||||||||||||||||||||||||||||||||||||
| Redemption price | 107.50% | ||||||||||||||||||||||||||||||||||||
| Redemption price after year three | 103.75% | ||||||||||||||||||||||||||||||||||||
| Redemption price afer year five | 101.00% | ||||||||||||||||||||||||||||||||||||
| Debt premium | 5,000,000 | ||||||||||||||||||||||||||||||||||||
| Amortization of premium | 4,000,000 | ||||||||||||||||||||||||||||||||||||
| Par value of senior notes | 104.00% | ||||||||||||||||||||||||||||||||||||
| Repayments of debt | 225,000,000 | 42,000,000 | |||||||||||||||||||||||||||||||||||
| Gross proceeds of aggregate principal amount additional issued | 130,000,000 | ||||||||||||||||||||||||||||||||||||
| Repurchase of Convertible senior notes | 122,900,000 | ||||||||||||||||||||||||||||||||||||
| Notes paid off | 2,100,000 | ||||||||||||||||||||||||||||||||||||
| Debt issuance costs | 11,600,000 | 5,400,000 | |||||||||||||||||||||||||||||||||||
| Debt issuance cost, Net of amortization | 8,100,000 | ||||||||||||||||||||||||||||||||||||
| Redemption date | Apr. 01, 2014 | ||||||||||||||||||||||||||||||||||||
| Percentage of redemption price after notice | 104.563% | ||||||||||||||||||||||||||||||||||||
| Percentage of repurchase | 101.00% | ||||||||||||||||||||||||||||||||||||
| Senior secured credit facility | 80,000,000.0 | 50,000,000.0 | |||||||||||||||||||||||||||||||||||
| Proceeds from issuance of term note | 225,000,000 | 225,000,000 | |||||||||||||||||||||||||||||||||||
| Payments of debt extinguishment costs | 0 | 519,000 | 5,200,000 | ||||||||||||||||||||||||||||||||||
| Aggregate commitment amount | 180,000,000.0 | 250,000,000.0 | |||||||||||||||||||||||||||||||||||
| Maturity of credit facility | Dec. 14, 2017 | ||||||||||||||||||||||||||||||||||||
| Variation in applicable rate for LIBOR Rate Loan | 2.50% | ||||||||||||||||||||||||||||||||||||
| Variation in applicable rate for LIBOR Rate Loan | 3.00% | ||||||||||||||||||||||||||||||||||||
| Variation in applicable rate for Base Rate Loan | 1.50% | ||||||||||||||||||||||||||||||||||||
| Variation in applicable rate for Base Rate Loan | 2.00% | ||||||||||||||||||||||||||||||||||||
| Line of credit facility quarterly decrease in borrowing capacity | 2,500,000.0 | ||||||||||||||||||||||||||||||||||||
| Line of credit facility, maximum borrowing capacity in year two | 42,500,000.0 | ||||||||||||||||||||||||||||||||||||
| Line of credit facility, maximum borrowing capacity in year three | 37,500,000.0 | ||||||||||||||||||||||||||||||||||||
| Revolving loan outstanding | 0 | 0 | |||||||||||||||||||||||||||||||||||
| Letters of credit outstanding | 3,800,000 | 4,500,000 | |||||||||||||||||||||||||||||||||||
| Long-term Debt | 653,968,000 | 479,205,000 | 428,968,000 | 429,205,000 | 225,000,000 | 0 | 0 | 50,000,000 | 50,000,000 | 125,000,000 | |||||||||||||||||||||||||||
| Principal payments | $ 2,500,000 | ||||||||||||||||||||||||||||||||||||
| Base rate plus | 2.00% | ||||||||||||||||||||||||||||||||||||
| LIBOR plus | 3.00% | ||||||||||||||||||||||||||||||||||||