Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	$ 151,890	$ 160,370
Expenses:
Direct expenses	156,874	156,226
Selling, general and administrative expenses	24,869	15,459
Total operating expenses	181,743	171,685
Loss on disposal of assets	51	879
Equity in (income) loss of unconsolidated affiliate, net	(1,361)	37
Operating (loss) income	(28,543)	(12,231)
Interest expense	8,166	8,197
Reorganization items, net	1,600	0
Other income, net	40	1,045
Total expenses	9,806	9,242
(Loss) earnings before income taxes	(38,349)	(21,473)
Income tax benefit	(3,108)	(4,490)
Net loss	(35,241)	(16,983)
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	(5,783)	(25,933)
Expenses:
Direct expenses	(5,783)	(25,914)
Selling, general and administrative expenses	(4)	(4)
Total operating expenses	(5,787)	(25,918)
Operating (loss) income	4	(15)
Equity in net income of consolidated subsidiaries	(1,127)	2,099
Interest expense	0	(542)
Other income, net	4	527
Total expenses	(1,123)	2,084
(Loss) earnings before income taxes	1,127	(2,099)
Net loss	1,127	(2,099)
Parent Company Only (issuer) [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	74,032	78,092
Expenses:
Direct expenses	84,502	83,997
Selling, general and administrative expenses	18,050	8,747
Total operating expenses	102,552	92,744
Loss on disposal of assets	51	879
Equity in (income) loss of unconsolidated affiliate, net	(1,361)	37
Operating (loss) income	(27,210)	(15,568)
Equity in net income of consolidated subsidiaries	1,127	(2,099)
Interest expense	8,162	8,195
Reorganization items, net	1,600
Other income, net	(188)	305
Total expenses	10,701	6,401
(Loss) earnings before income taxes	(37,911)	(21,969)
Income tax benefit	(2,670)	(4,986)
Net loss	(35,241)	(16,983)
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	59,302	58,709
Expenses:
Direct expenses	59,026	55,364
Selling, general and administrative expenses	3,437	3,167
Total operating expenses	62,463	58,531
Loss on disposal of assets		0
Operating (loss) income	(3,161)	178
Interest expense	4	1
Other income, net		0
Total expenses	4	1
(Loss) earnings before income taxes	(3,165)	177
Income tax benefit	(935)	0
Net loss	(2,230)	177
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	24,339	49,502
Expenses:
Direct expenses	19,129	42,779
Selling, general and administrative expenses	3,386	3,549
Total operating expenses	22,515	46,328
Loss on disposal of assets	0
Equity in (income) loss of unconsolidated affiliate, net		0
Operating (loss) income	1,824	3,174
Interest expense	0	543
Other income, net	224	213
Total expenses	224	756
(Loss) earnings before income taxes	1,600	2,418
Income tax benefit	497	496
Net loss	$ 1,103	$ 1,922