Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Consolidating Condensed Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Condensed Financial Statements [Line Items]        
Total revenues $ 226,001 $ 178,925 $ 393,156 $ 355,494
Operating expenses 143,549 104,526 260,595 199,458
Depreciation and amortization 32,280 27,959 61,792 55,578
Total operating gross margin 50,172 46,440 70,769 100,458
General and administration expense (22,378) [1] (7,420) [1] (35,261) [1] (12,917)
Gain on disposition of assets, net 517 1,368 1,665 1,860
Total operating income (loss) 28,311 40,388 37,173 89,401
Other income and (expense):        
Interest expense (10,741) (8,925) (20,747) (16,962)
Changes in fair value of derivative positions 17 38 54 (11)
Interest income 2,203 53 2,251 79
Loss on extinguishment of debt 0 (1,649) 0 (1,649)
Other (183) 20 (56) 36
Equity in net earnings of subsidiaries 0 0 0 0
Total other expense (8,704) (10,463) (18,498) (18,507)
Income (benefit) before income taxes 19,607 29,925 18,675 70,894
Income tax expense (benefit):        
Deferred     1,800 10,432
Income tax expense (benefit) 11,233 9,817 9,729 24,460
Net income (loss) 8,374 20,108 8,946 46,434
Less: Net (loss) attributable to noncontrolling interest 93 25 73 (41)
Net income 8,281 20,083 8,873 46,475
Parent [Member]
        
Condensed Financial Statements [Line Items]        
Total revenues 0 0 0 0
Operating expenses 0 0 0 0
Depreciation and amortization 0 0 0 0
Total operating gross margin 0 0 0 0
General and administration expense (46) [1] (44) [1] (91) [1] (90)
Gain on disposition of assets, net 0 0 0 0
Total operating income (loss) (46) (44) (91) (90)
Other income and (expense):        
Interest expense (11,719) (9,817) (22,699) (18,818)
Changes in fair value of derivative positions 17 38 54 (11)
Interest income 1,437 8,504 3,006 8,600
Loss on extinguishment of debt   (1,649)   (1,649)
Other 0 0 0 0
Equity in net earnings of subsidiaries 13,828 19,057 14,007 50,957
Total other expense 3,563 16,133 (5,632) 39,079
Income (benefit) before income taxes 3,517 16,089 (5,723) 38,989
Income tax expense (benefit):        
Deferred     (4,560) 7,025
Income tax expense (benefit) (4,764) (3,994) (14,596) (7,486)
Net income (loss) 8,281 20,083 8,873 46,475
Less: Net (loss) attributable to noncontrolling interest 0 0 0 0
Net income 8,281 20,083 8,873 46,475
Guarantor [Member]
        
Condensed Financial Statements [Line Items]        
Total revenues 121,848 104,767 226,210 203,924
Operating expenses 63,833 47,632 122,411 90,999
Depreciation and amortization 18,721 15,665 37,380 31,261
Total operating gross margin 39,294 41,470 66,419 81,664
General and administration expense (22,160) [1] (7,078) [1] (34,914) [1] (12,450)
Gain on disposition of assets, net 843 197 1,952 615
Total operating income (loss) 17,977 34,589 33,457 69,829
Other income and (expense):        
Interest expense (35) (35) (59) (71)
Changes in fair value of derivative positions 0 0 0 0
Interest income 1,144 4,537 1,334 4,715
Loss on extinguishment of debt   0   0
Other (269) 23 (167) 36
Equity in net earnings of subsidiaries 0 0 0 0
Total other expense 840 4,525 1,108 4,680
Income (benefit) before income taxes 18,817 39,114 34,565 74,509
Income tax expense (benefit):        
Deferred     6,261 3,832
Income tax expense (benefit) 12,182 13,668 17,771 27,698
Net income (loss) 6,635 25,446 16,794 46,811
Less: Net (loss) attributable to noncontrolling interest 0 0 0 0
Net income 6,635 25,446 16,794 46,811
Non-Guarantor [Member]
        
Condensed Financial Statements [Line Items]        
Total revenues 133,057 98,036 219,357 201,061
Operating expenses 108,620 80,772 190,595 157,950
Depreciation and amortization 13,559 12,294 24,412 24,317
Total operating gross margin 10,878 4,970 4,350 18,794
General and administration expense (172) [1] (298) [1] (256) [1] (377)
Gain on disposition of assets, net (326) 1,171 (287) 1,245
Total operating income (loss) 10,380 5,843 3,807 19,662
Other income and (expense):        
Interest expense (2,765) (2,023) (6,182) (3,972)
Changes in fair value of derivative positions 0 0 0 0
Interest income 3,400 34,070 6,104 36,771
Loss on extinguishment of debt   0   0
Other 86 (3) 111 0
Equity in net earnings of subsidiaries 0 0 0 0
Total other expense 721 32,044 33 32,799
Income (benefit) before income taxes 11,101 37,887 3,840 52,461
Income tax expense (benefit):        
Deferred     99 (425)
Income tax expense (benefit) 3,815 143 6,554 4,248
Net income (loss) 7,286 37,744 (2,714) 48,213
Less: Net (loss) attributable to noncontrolling interest 93 25 73 (41)
Net income 7,193 37,719 (2,787) 48,254
Eliminations [Member]
        
Condensed Financial Statements [Line Items]        
Total revenues (28,904) (23,878) (52,411) (49,491)
Operating expenses (28,904) (23,878) (52,411) (49,491)
Depreciation and amortization 0 0 0 0
Total operating gross margin 0 0 0 0
General and administration expense 0 [1] 0 [1] 0 [1] 0
Gain on disposition of assets, net 0 0 0 0
Total operating income (loss) 0 0 0 0
Other income and (expense):        
Interest expense 3,778 2,950 8,193 5,899
Changes in fair value of derivative positions 0 0 0 0
Interest income (3,778) (47,058) (8,193) (50,007)
Loss on extinguishment of debt   0   0
Other 0 0 0 0
Equity in net earnings of subsidiaries (13,828) (19,057) (14,007) (50,957)
Total other expense (13,828) (63,165) (14,007) (95,065)
Income (benefit) before income taxes (13,828) (63,165) (14,007) (95,065)
Income tax expense (benefit):        
Deferred     0 0
Income tax expense (benefit) 0 0 0 0
Net income (loss) (13,828) (63,165) (14,007) (95,065)
Less: Net (loss) attributable to noncontrolling interest 0 0 0 0
Net income $ (13,828) $ (63,165) $ (14,007) $ (95,065)
[1] General and administration expenses for field operations are included in operating expenses.