v3.5.0.2
Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Condensed Income Statements, Captions [Line Items]        
Operating revenues, net $ 158,093 $ 214,733 $ 489,245 $ 617,477
Expenses:        
Direct expenses 144,938 182,064 449,909 520,099
Selling, general and administrative expenses 13,381 11,575 36,832 34,859
Total operating expenses 158,319 193,639 486,741 554,958
Loss (gain) on disposal of assets, net 85 (165) (3,854) (238)
Equity in loss of unconsolidated affiliate 198 75 274 249
Operating income (509) 21,184 6,084 62,508
Interest expense 7,719 7,366 22,792 21,691
Other income, net (462) (472) (1,571) (1,501)
Total expenses 7,257 6,894 21,221 20,190
(Loss) earnings before income taxes (7,766) 14,290 (15,137) 42,318
Income tax (benefit) expense (2,799) 6,621 (5,515) 17,832
Net (loss) earnings (4,967) 7,669 (9,622) 24,486
Parent Company Only (issuer) [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating revenues, net 79,532 124,505 260,766 368,202
Expenses:        
Direct expenses 83,188 111,876 264,761 321,841
Selling, general and administrative expenses 10,639 9,219 28,914 27,198
Total operating expenses 93,827 121,095 293,675 349,039
Loss (gain) on disposal of assets, net 85 (165) (3,854) (238)
Equity in loss of unconsolidated affiliate 198 75 274 249
Operating income (14,578) 3,500 (29,329) 19,152
Equity in net income of consolidated subsidiaries (8,372) (10,682) (20,462) (26,044)
Interest expense 7,716 7,274 22,762 21,599
Other income, net (812) (474) (2,415) (1,508)
Total expenses (1,468) (3,882) (115) (5,953)
(Loss) earnings before income taxes (13,110) 7,382 (29,214) 25,105
Income tax (benefit) expense (8,143) (287) (19,592) 619
Net (loss) earnings (4,967) 7,669 (9,622) 24,486
Guarantor Subsidiaries [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating revenues, net [1] 78,561 90,228 228,479 249,275
Expenses:        
Direct expenses [1] 61,750 70,192 185,148 198,271
Selling, general and administrative expenses [1] 3,092 2,356 8,766 7,661
Total operating expenses [1] 64,842 72,548 193,914 205,932
Operating income [1] 13,719 17,680 34,565 43,343
Interest expense [1] 3 92 30 92
Other income, net [1]   (2) (4) (6)
Total expenses [1] 3 90 26 86
(Loss) earnings before income taxes [1] 13,716 17,590 34,539 43,257
Income tax (benefit) expense [1] 5,344 6,908 14,077 17,213
Net (loss) earnings [1] 8,372 10,682 20,462 26,044
Eliminations [Member]        
Expenses:        
Direct expenses   (4)   (13)
Selling, general and administrative expenses (350)   (848)  
Total operating expenses (350) (4) (848) (13)
Operating income 350 4 848 13
Equity in net income of consolidated subsidiaries 8,372 10,682 20,462 26,044
Other income, net 350 4 848 13
Total expenses 8,722 10,686 21,310 26,057
(Loss) earnings before income taxes (8,372) (10,682) (20,462) (26,044)
Net (loss) earnings $ (8,372) $ (10,682) $ (20,462) $ (26,044)
[1] Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.