Registration of securities issued in business combination transactions

Acquisitions ITS - Additional Information (Detail)

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Acquisitions ITS - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Apr. 18, 2013
ITS [Member]
Apr. 22, 2013
ITS [Member]
Jun. 30, 2013
ITS [Member]
Sep. 30, 2013
ITS [Member]
Sep. 30, 2013
ITS [Member]
Apr. 22, 2013
ITS [Member]
Accounts Receivable [Member]
Sep. 30, 2013
ITS [Member]
Term Note Due April 2018 [Member]
Jul. 30, 2013
ITS [Member]
Term Note Due April 2018 [Member]
Business Acquisition [Line Items]                                            
Cash paid to, or on behalf of, ITS and its equity holders                               $ 101,000,000            
Cash paid for acquisition                               24,000,000            
Fair value of contingent consideration deposited in escrow for assets not acquired (1)                               5,000,000 [1]            
Assets, Fair Value Disclosure                                       0    
Acquisition related costs                                   4,800,000 4,800,000      
Consulting expenses                                   19,200,000 19,200,000      
Debt issuance costs                                   5,400,000        
Long-term Debt 653,968,000 479,205,000       482,723,000       653,968,000   479,205,000 482,723,000               125,000,000  
Proceeds from issuance of term note                             225,000,000              
Debt instrument fixed interest rate                                         7.50%  
Deferred acquisition costs                                         5,200,000 5,300,000
Revenues 237,762,000 157,187,000 165,301,000 178,925,000 176,569,000 181,066,000 176,589,000 172,812,000 156,179,000 630,918,000 520,795,000 677,982,000 686,646,000 659,475,000     58,500,000          
Net income $ 8,118,000   $ 10,831,000             $ 17,064,000 $ 57,265,000 $ 37,098,000 $ (50,645,000) $ (14,708,000)     $ 4,400,000          
[1] Based on the terms of the Agreement, $5.0 million of the $24.0 million in escrow to be paid to the seller is contingent upon certain future liabilities that could become due by ITS in certain jurisdictions. Any payments in relation to these liabilities will be deducted from the $5.0 million escrow amount and the net balance of the escrow will be paid to the seller. We estimate that the entire $5.0 million in escrow will be paid to the seller, and therefore, the estimated fair value of the consideration in escrow related to these liabilities is $5.0 million. We do not expect to receive any amount back from escrow, and therefore did not record a receivable from the escrow. Any changes to the fair value of the contingent consideration in the future of less than $5.0 million will result in recording a receivable from escrow. The receivable will be recorded at fair value. As of September 30, 2013, the fair value of the receivable is $0.0 million.