Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Condensed Income Statements, Captions [Line Items]
Operating revenues, net		$ 134,618	$ 164,016
Expenses:
Direct expenses		136,513	152,554
Selling, general and administrative expenses		13,044	11,673
Total operating expenses		149,557	164,227
Equity in loss of unconsolidated affiliate		1,003
Loss on disposal of assets, net			359
Operating (loss) income		(15,942)	(570)
Interest expense		8,195	7,533
Other income, net		(1,064)	(615)
Total expenses		7,131	6,918
(Loss) earnings before income taxes		(23,073)	(7,488)
Income tax (benefit) expense		(7,825)	1,444
Net (loss) earnings		(15,248)	(8,932)
Parent Company Only (issuer) [Member]
Condensed Income Statements, Captions [Line Items]
Operating revenues, net		74,284	91,869
Expenses:
Direct expenses		82,344	92,037
Selling, general and administrative expenses		10,108	9,044
Total operating expenses		92,452	101,081
Equity in loss of unconsolidated affiliate		1,003
Loss on disposal of assets, net			359
Operating (loss) income		(19,171)	(9,571)
Equity in net income of consolidated subsidiaries		(2,631)	(5,054)
Interest expense		8,174	7,513
Other income, net		(1,067)	(786)
Total expenses		4,476	1,673
(Loss) earnings before income taxes		(23,647)	(11,244)
Income tax (benefit) expense		(8,399)	(2,312)
Net (loss) earnings		(15,248)	(8,932)
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Operating revenues, net	[1]	60,334	72,147
Expenses:
Direct expenses	[1]	54,169	60,517
Selling, general and administrative expenses	[1]	2,940	2,802
Total operating expenses	[1]	57,109	63,319
Operating (loss) income	[1]	3,225	8,828
Interest expense	[1]	21	20
Other income, net	[1]	(1)	(2)
Total expenses	[1]	20	18
(Loss) earnings before income taxes	[1]	3,205	8,810
Income tax (benefit) expense	[1]	574	3,756
Net (loss) earnings	[1]	2,631	5,054
Eliminations [Member]
Expenses:
Selling, general and administrative expenses		(4)	(173)
Total operating expenses		(4)	(173)
Operating (loss) income		4	173
Equity in net income of consolidated subsidiaries		2,631	5,054
Other income, net		4	173
Total expenses		2,635	5,227
(Loss) earnings before income taxes		(2,631)	(5,054)
Net (loss) earnings		$ (2,631)	$ (5,054)

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