Segments - Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 23,796	$ 43,098	$ 86,204	$ 130,965
Direct operating expenses	19,022	34,297	69,049	101,371
General and administrative expenses	4,084	4,774	13,453	15,529
Depreciation and amortization	6,821	8,928	21,966	27,340
Operating income (loss)	(6,131)	(5,017)	(33,843)	(13,502)
Income (loss) before income taxes	(7,125)	(6,006)	(36,933)	(17,242)
Total assets	195,936		195,936		$ 236,099
Total assets held for sale	778		778		2,664
Operating Segments | Rocky Mountain
Segment Reporting Information [Line Items]
Revenue	11,308	27,996	46,998	81,866
Direct operating expenses	9,700	22,023	39,709	64,205
General and administrative expenses	836	1,377	3,849	3,629
Depreciation and amortization	2,810	4,191	9,149	12,797
Operating income (loss)	(2,038)	285	(17,892)	1,115
Income (loss) before income taxes	(2,203)	136	(18,244)	819
Total assets	60,730		60,730		93,504
Total assets held for sale	0		0		1,751
Operating Segments | Northeast
Segment Reporting Information [Line Items]
Revenue	8,540	10,605	26,496	33,165
Direct operating expenses	6,405	8,750	20,369	27,072
General and administrative expenses	460	647	1,528	2,222
Depreciation and amortization	2,514	2,667	7,597	8,152
Operating income (loss)	(839)	(1,459)	(2,998)	(4,398)
Income (loss) before income taxes	(945)	(1,355)	(3,324)	(4,510)
Total assets	57,218		57,218		64,023
Total assets held for sale	0		0		135
Operating Segments | Southern
Segment Reporting Information [Line Items]
Revenue	3,948	4,497	12,710	15,934
Direct operating expenses	2,917	3,524	8,971	10,094
General and administrative expenses	194	72	704	825
Depreciation and amortization	1,486	2,063	5,201	6,359
Operating income (loss)	(649)	(1,158)	(5,562)	(1,334)
Income (loss) before income taxes	(698)	(1,215)	(5,718)	(1,500)
Total assets	63,279		63,279		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	2,594	2,678	7,372	8,853
Depreciation and amortization	11	7	19	32
Operating income (loss)	(2,605)	(2,685)	(7,391)	(8,885)
Income (loss) before income taxes	(3,279)	$ (3,572)	(9,647)	$ (12,051)
Total assets	14,709		14,709		7,731
Total assets held for sale	$ 778		$ 778		$ 778