Quarterly report pursuant to Section 13 or 15(d)

Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Consolidating Condensed Statement of Operations (Detail)

v2.4.0.6
Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Consolidating Condensed Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Financial Statements [Line Items]    
Total revenues $ 167,155 $ 176,569
Operating expenses 117,046 94,932
Depreciation and amortization 29,512 27,619
Total operating gross margin 20,597 54,018
General and administration expense (12,883) (5,497)
Gain on disposition of assets, net 1,148 492
Total operating income (loss) 8,862 49,013
Other income and (expense):    
Interest expense (10,006) (8,037)
Interest income 59 26
Changes in fair value of derivative positions 37 (49)
Other 116 16
Total other expense (9,794) (8,044)
Income (benefit) before income taxes (932) 40,969
Income tax expense (benefit):    
Current   9,631
Deferred (1,607) 5,012
Income tax expense (benefit) (1,504) 14,643
Net income (loss) 572 26,326
Less: Net (loss) attributable to noncontrolling interest (20) (66)
Net income (loss) attributable to controlling interest 592 26,392
Parent [Member]
    
Condensed Financial Statements [Line Items]    
General and administration expense (45) (45)
Total operating income (loss) (45) (45)
Other income and (expense):    
Interest expense (10,980) (9,001)
Interest income 1,569 95
Changes in fair value of derivative positions 37 (49)
Equity in net earnings of subsidiaries 179 31,900
Total other expense (9,195) 22,945
Income (benefit) before income taxes (9,240) 22,900
Income tax expense (benefit):    
Current   (8,110)
Deferred (8,310) 4,618
Income tax expense (benefit) (9,832) (3,492)
Net income (loss) 592 26,392
Net income (loss) attributable to controlling interest 592 26,392
Guarantor [Member]
    
Condensed Financial Statements [Line Items]    
Total revenues 104,362 99,157
Operating expenses 58,578 43,559
Depreciation and amortization 18,659 15,595
Total operating gross margin 27,125 40,003
General and administration expense (12,754) (5,374)
Gain on disposition of assets, net 1,108 418
Total operating income (loss) 15,479 35,047
Other income and (expense):    
Interest expense (24) (36)
Interest income 190 178
Other 103 13
Total other expense 269 155
Income (benefit) before income taxes 15,748 35,202
Income tax expense (benefit):    
Current   11,479
Deferred 2,936 2,550
Income tax expense (benefit) 5,589 14,029
Net income (loss) 10,159 21,173
Net income (loss) attributable to controlling interest 10,159 21,173
Non-Guarantor [Member]
    
Condensed Financial Statements [Line Items]    
Total revenues 86,300 103,025
Operating expenses 81,975 76,986
Depreciation and amortization 10,853 12,024
Total operating gross margin (6,528) 14,015
General and administration expense (84) (78)
Gain on disposition of assets, net 40 74
Total operating income (loss) (6,572) 14,011
Other income and (expense):    
Interest expense (3,417) (1,949)
Interest income 2,715 2,702
Other 13 3
Total other expense (689) 756
Income (benefit) before income taxes (7,261) 14,767
Income tax expense (benefit):    
Current   6,262
Deferred 3,767 (2,156)
Income tax expense (benefit) 2,739 4,106
Net income (loss) (10,000) 10,661
Less: Net (loss) attributable to noncontrolling interest (20) (66)
Net income (loss) attributable to controlling interest (9,980) 10,727
Eliminations [Member]
    
Condensed Financial Statements [Line Items]    
Total revenues (23,507) (25,613)
Operating expenses (23,507) (25,613)
Other income and (expense):    
Interest expense 4,415 2,949
Interest income (4,415) (2,949)
Equity in net earnings of subsidiaries (179) (31,900)
Total other expense (179) (31,900)
Income (benefit) before income taxes (179) (31,900)
Income tax expense (benefit):    
Net income (loss) (179) (31,900)
Net income (loss) attributable to controlling interest $ (179) $ (31,900)