v3.3.1.900
Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Income Statements, Captions [Line Items]                      
Operating revenues, net $ 186,751 $ 214,733 $ 198,547 $ 204,197 $ 210,760 $ 216,294 $ 212,145 $ 197,071 $ 804,228 $ 836,270 $ 856,500
Expenses:                      
Direct expenses                 687,050 670,007 713,090
Selling, general, and administrative expenses                 46,422 43,171 38,820
Total operating expenses                 733,472 713,178 751,910
Loss (gain) on disposition of assets, net 577 (165) (66) (7) (523) 56 242 1,073 339 848 (16,604)
Impairment of assets                   10,508 1,648
Equity in loss of unconsolidated affiliate                 306 96 262
Operating income                 70,111 111,640 119,284
Interest expense                 29,066 29,510 29,756
Loss on debt extinguishment                   29,833  
Other (income) expense, net                 (2,211) (818) (613)
Total expenses                 26,855 58,525 29,143
Earnings before income taxes 938 14,290 11,044 16,984 11,651 28,277 21,700 (8,513) 43,256 53,115 90,141
Income tax (benefit) expense                 16,332 20,427 31,185
Net earnings $ 2,438 $ 7,669 $ 6,454 $ 10,363 $ 7,392 $ 17,249 $ 13,368 $ (5,321) 26,924 32,688 58,956
Parent Company Only (issuer) [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Operating revenues, net                 476,969 504,180 564,445
Expenses:                      
Direct expenses                 426,239 411,398 468,321
Selling, general, and administrative expenses                 35,694 32,985 29,885
Management fees                     (11,682)
Total operating expenses                 461,933 444,383 486,524
Loss (gain) on disposition of assets, net                 339 848 (16,585)
Impairment of assets                   10,508 1,227
Equity in loss of unconsolidated affiliate                 306 96 262
Operating income                 14,391 48,345 93,017
Equity in net earnings of consolidated subsidiaries                 (31,225) (38,740) (15,567)
Interest expense                 28,946 29,510 29,434
Loss on debt extinguishment                   29,833  
Other (income) expense, net                 (2,222) (819) (613)
Total expenses                 (4,501) 19,784 13,254
Earnings before income taxes                 18,992 28,561 79,763
Income tax (benefit) expense                 (8,032) (4,127) 20,807
Net earnings                 26,924 32,688 58,956
Guarantor Subsidiaries [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Operating revenues, net [1]                 327,259 332,090 292,055
Expenses:                      
Direct expenses [1]                 260,829 258,627 244,769
Selling, general, and administrative expenses [1]                 10,728 10,186 8,935
Management fees [1]                     11,682
Total operating expenses [1]                 271,557 268,813 265,386
Loss (gain) on disposition of assets, net [1]                     (19)
Impairment of assets [1]                     421
Operating income [1]                 55,702 63,277 26,267
Interest expense [1]                 120   322
Other (income) expense, net [1]                 (7) (17)  
Total expenses [1]                 113 (17) 322
Earnings before income taxes [1]                 55,589 63,294 25,945
Income tax (benefit) expense [1]                 24,364 24,554 10,378
Net earnings [1]                 31,225 38,740 15,567
Eliminations [Member]                      
Expenses:                      
Direct expenses                 (18) (18)  
Total operating expenses                 (18) (18)  
Operating income                 18 18  
Equity in net earnings of consolidated subsidiaries                 31,225 38,740 15,567
Other (income) expense, net                 18 18  
Total expenses                 31,243 38,758 15,567
Earnings before income taxes                 (31,225) (38,740) (15,567)
Net earnings                 $ (31,225) $ (38,740) $ (15,567)
[1] Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.