SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 165,649	$ 154,016	$ 313,104	$ 287,818
Depreciation and amortization	17,386	15,868	33,370	29,717
Operating income (loss)	15,149	(47,279)	15,986	(40,714)
Total assets	652,574	588,877	652,574	588,877	$ 614,949
Operating Segments | Eastern
Segment Reporting Information [Line Items]
Revenues	53,589	46,574	98,094	85,260
Depreciation and amortization	7,030	6,423	13,009	11,827
Operating income (loss)	4,266	(60,324)	2,454	(60,304)
Total assets	180,330	158,042	180,330	158,042
Operating Segments | Western
Segment Reporting Information [Line Items]
Revenues	71,043	64,372	135,783	118,515
Depreciation and amortization	8,351	7,586	16,382	14,191
Operating income (loss)	11,989	10,770	19,182	14,859
Total assets	354,284	328,207	354,284	328,207
Operating Segments | Recycling
Segment Reporting Information [Line Items]
Revenues	9,600	16,211	19,757	32,846
Depreciation and amortization	1,043	1,019	2,097	2,022
Operating income (loss)	(2,250)	1,064	(7,418)	2,647
Total assets	49,477	50,398	49,477	50,398
Operating Segments | Other
Segment Reporting Information [Line Items]
Revenues	31,417	26,859	59,470	51,197
Depreciation and amortization	962	840	1,882	1,677
Operating income (loss)	1,144	1,211	1,768	2,084
Total assets	68,483	52,230	68,483	52,230
Eliminations
Segment Reporting Information [Line Items]
Revenues	(37,598)	(32,193)	(69,038)	(57,627)
Depreciation and amortization	0	0	0	0
Operating income (loss)	0	0	0	0
Total assets	0	0	0	0
Eliminations | Eastern
Segment Reporting Information [Line Items]
Revenues	14,569	13,202	25,876	22,724
Eliminations | Western
Segment Reporting Information [Line Items]
Revenues	20,689	18,625	39,320	34,407
Eliminations | Recycling
Segment Reporting Information [Line Items]
Revenues	1,738	(245)	2,923	(489)
Eliminations | Other
Segment Reporting Information [Line Items]
Revenues	$ 602	$ 611	$ 919	$ 985