Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	$ 165,172		$ 169,243	$ 317,062	$ 329,607
Expenses:
Direct expenses	153,514		155,083	310,390	311,309
Selling, general and administrative expenses	17,591		14,485	42,458	29,944
Total operating expenses	171,105		169,568	352,848	341,253
(Gain) loss on asset dispositions	(95)		(171)	(44)	708
Equity in (income) loss of unconsolidated affiliate, net	(1,039)		(81)	(2,400)	(45)
Operating loss	(4,799)		(73)	(33,342)	(12,309)
Interest expense	3,927		8,340	12,093	16,537
Reorganization items, net	26,503	$ 1,600		28,103
Other income, net	(333)		364	(293)	1,404
Total expenses	30,097		8,704	39,903	17,941
Loss before income taxes	(34,896)		(8,777)	(73,245)	(30,250)
Income tax (benefit) expense	(2,819)		(1,684)	(5,927)	(6,175)
Net loss	(32,077)		(7,093)	(67,318)	(24,075)
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	(8,075)		(30,735)	(13,859)	(56,668)
Expenses:
Direct expenses	(8,075)		(30,793)	(13,859)	(56,707)
Selling, general and administrative expenses	(4)		(4)	(9)	(10)
Total operating expenses	(8,079)		(30,797)	(13,868)	(56,717)
Operating loss	4		62	9	49
Equity in net income of consolidated subsidiaries	4,952		6,064	3,825	8,163
Interest expense			(539)		(1,081)
Other income, net	4		601	9	1,130
Total expenses	4,956		6,126	3,834	8,212
Loss before income taxes	(4,952)		(6,064)	(3,825)	(8,163)
Net loss	(4,952)		(6,064)	(3,825)	(8,163)
Parent Company Only (issuer) [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	75,707		79,857	149,740	157,949
Expenses:
Direct expenses	76,288		78,955	160,793	162,953
Selling, general and administrative expenses	10,459		8,395	28,507	17,143
Total operating expenses	86,747		87,350	189,300	180,096
(Gain) loss on asset dispositions	(102)		(150)	(51)	729
Equity in (income) loss of unconsolidated affiliate, net	(1,039)		(81)	(2,400)	(45)
Operating loss	(9,899)		(7,262)	(37,109)	(22,831)
Equity in net income of consolidated subsidiaries	(4,952)		(6,064)	(3,825)	(8,163)
Interest expense	3,908		8,337	12,070	16,533
Reorganization items, net	26,503			28,103
Other income, net	(46)		(365)	(235)	(63)
Total expenses	25,413		1,908	36,113	8,307
Loss before income taxes	(35,312)		(9,170)	(73,222)	(31,138)
Income tax (benefit) expense	(3,235)		(2,077)	(5,904)	(7,063)
Net loss	(32,077)		(7,093)	(67,318)	(24,075)
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	72,628		68,717	131,930	127,426
Expenses:
Direct expenses	61,915		58,263	120,941	113,627
Selling, general and administrative expenses	4,293		3,256	7,731	6,423
Total operating expenses	66,208		61,519	128,672	120,050
(Gain) loss on asset dispositions	9			9
Operating loss	6,411		7,198	3,249	7,376
Interest expense	19			23
Total expenses	19			23
Loss before income taxes	6,392		7,198	3,226	7,376
Income tax (benefit) expense	792			(144)
Net loss	5,600		7,198	3,370	7,376
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	24,912		51,404	49,251	100,900
Expenses:
Direct expenses	23,386		48,658	42,515	91,436
Selling, general and administrative expenses	2,843		2,838	6,229	6,388
Total operating expenses	26,229		51,496	48,744	97,824
(Gain) loss on asset dispositions	(2)		(21)	(2)	(21)
Operating loss	(1,315)		(71)	509	3,097
Interest expense			542		1,085
Other income, net	(291)		128	(67)	337
Total expenses	(291)		670	(67)	1,422
Loss before income taxes	(1,024)		(741)	576	1,675
Income tax (benefit) expense	(376)		393	121	888
Net loss	$ (648)		$ (1,134)	$ 455	$ 787