Segments - Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 24,466	$ 45,240	$ 62,408	$ 87,867
Direct operating expenses	18,551	34,517	50,027	67,074
General and administrative expenses	4,445	5,280	9,369	10,755
Depreciation and amortization	7,156	9,277	15,145	18,412
Operating loss	(5,686)	(3,828)	(27,712)	(8,485)
Loss before income taxes	(6,764)	(4,960)	(29,808)	(11,236)
Total assets	205,319		205,319		$ 236,099
Total assets held for sale	778		778		2,664
Operating Segments | Rocky Mountain
Segment Reporting Information [Line Items]
Revenue	12,222	28,993	35,690	53,870
Direct operating expenses	10,458	22,354	30,009	42,182
General and administrative expenses	1,524	1,206	3,013	2,252
Depreciation and amortization	2,874	4,307	6,339	8,606
Operating loss	(2,634)	1,126	(15,854)	830
Loss before income taxes	(2,786)	1,041	(16,041)	683
Total assets	64,093		64,093		93,504
Total assets held for sale	0		0		1,751
Operating Segments | Northeast
Segment Reporting Information [Line Items]
Revenue	8,162	10,720	17,956	22,560
Direct operating expenses	5,593	8,607	13,964	18,322
General and administrative expenses	434	729	1,068	1,575
Depreciation and amortization	2,532	2,821	5,083	5,485
Operating loss	(397)	(1,437)	(2,159)	(2,939)
Loss before income taxes	(504)	(1,560)	(2,379)	(3,155)
Total assets	59,668		59,668		64,023
Total assets held for sale	0		0		135
Operating Segments | Southern
Segment Reporting Information [Line Items]
Revenue	4,082	5,527	8,762	11,437
Direct operating expenses	2,500	3,556	6,054	6,570
General and administrative expenses	240	354	510	753
Depreciation and amortization	1,746	2,136	3,715	4,296
Operating loss	(404)	(513)	(4,913)	(176)
Loss before income taxes	(457)	(576)	(5,020)	(285)
Total assets	64,535		64,535		70,841
Total assets held for sale	0		0		0
Corporate/ Other
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Direct operating expenses	0	0	0	0
General and administrative expenses	2,247	2,991	4,778	6,175
Depreciation and amortization	4	13	8	25
Operating loss	(2,251)	(3,004)	(4,786)	(6,200)
Loss before income taxes	(3,017)	$ (3,865)	(6,368)	$ (8,479)
Total assets	17,023		17,023		7,731
Total assets held for sale	$ 778		$ 778		$ 778