Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]
Operating revenues, net		$ 144,853	$ 158,093	$ 167,136	$ 164,016	$ 186,751	$ 214,733	$ 198,547	$ 204,197	$ 634,098	$ 804,228	$ 836,270
Expenses:
Direct expenses										592,550	687,050	670,007
Selling, general, and administrative expenses										44,418	46,422	43,171
Total operating expenses										636,968	733,472	713,178
(Gain) loss on disposition of assets, net		504	85	(4,298)	359	577	(165)	(66)	(7)	(3,350)	339	848
Impairment of assets										407		10,508
Equity in profit (loss) of unconsolidated affiliate										(151)	306	96
Operating (loss) income										224	70,111	111,640
Interest expense										30,644	29,066	29,510
Loss on debt extinguishment												29,833
Other income, net										(3,271)	(2,211)	(818)
Total expenses										27,373	26,855	58,525
(Loss) earnings before income taxes		(12,012)	(7,766)	117	(7,488)	938	14,290	11,044	16,984	(27,149)	43,256	53,115
Income tax (benefit) expense										(469)	16,332	20,427
Net (loss) earnings		$ (17,058)	$ (4,967)	$ 4,277	$ (8,932)	$ 2,438	$ 7,669	$ 6,454	$ 10,363	(26,680)	26,924	32,688
Parent Company Only (issuer) [Member]
Condensed Income Statements, Captions [Line Items]
Operating revenues, net										339,829	476,969	504,180
Expenses:
Direct expenses										347,532	426,239	411,398
Selling, general, and administrative expenses										32,911	35,694	32,985
Total operating expenses										380,443	461,933	444,383
(Gain) loss on disposition of assets, net										(3,350)	339	848
Impairment of assets										407		10,508
Equity in profit (loss) of unconsolidated affiliate										(151)	306	96
Operating (loss) income										(37,520)	14,391	48,345
Equity in net earnings of consolidated subsidiaries										(22,182)	(31,225)	(38,740)
Interest expense										30,585	28,946	29,510
Loss on debt extinguishment												29,833
Other income, net										(3,284)	(2,222)	(819)
Total expenses										5,119	(4,501)	19,784
(Loss) earnings before income taxes										(42,639)	18,892	28,561
Income tax (benefit) expense										(15,959)	(8,032)	(4,127)
Net (loss) earnings										(26,680)	26,924	32,688
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Operating revenues, net	[1]									294,269	327,259	332,090
Expenses:
Direct expenses	[1]									245,018	260,829	258,627
Selling, general, and administrative expenses	[1]									11,525	10,728	10,186
Total operating expenses	[1]									256,543	271,557	268,813
Operating (loss) income	[1]									37,726	55,702	63,277
Interest expense	[1]									59	120
Other income, net	[1]									(5)	(7)	(17)
Total expenses	[1]									54	113	(17)
(Loss) earnings before income taxes	[1]									37,672	55,589	63,294
Income tax (benefit) expense	[1]									15,490	24,364	24,554
Net (loss) earnings	[1]									22,182	31,225	38,740
Eliminations [Member]
Expenses:
Direct expenses											(18)	(18)
Selling, general, and administrative expenses										(18)
Total operating expenses										(18)	(18)	(18)
Operating (loss) income										18	18	18
Equity in net earnings of consolidated subsidiaries										22,182	31,225	38,740
Other income, net										18	18	18
Total expenses										22,200	31,243	38,758
(Loss) earnings before income taxes										(22,182)	(31,225)	(38,740)
Net (loss) earnings										$ (22,182)	$ (31,225)	$ (38,740)

[1] Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.