SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 163,664	$ 147,455
Depreciation and amortization	17,489	15,983
Operating income (loss)	4,442	838
Total assets	828,313		$ 732,410
Operating Segments
Segment Reporting Information [Line Items]
Revenues	163,664	147,455
Depreciation and amortization	17,489	15,983
Operating income (loss)	4,442	838
Total assets	828,313	631,375
Operating Segments | Eastern
Segment Reporting Information [Line Items]
Revenues	46,997	44,505
Depreciation and amortization	5,260	5,979
Operating income (loss)	(626)	(1,812)
Total assets	195,851	174,860
Operating Segments | Western
Segment Reporting Information [Line Items]
Revenues	73,634	64,739
Depreciation and amortization	10,239	8,032
Operating income (loss)	5,356	7,194
Total assets	493,775	342,285
Operating Segments | Recycling
Segment Reporting Information [Line Items]
Revenues	10,766	10,157
Depreciation and amortization	969	1,054
Operating income (loss)	(941)	(5,167)
Total assets	54,829	47,065
Operating Segments | Other
Segment Reporting Information [Line Items]
Revenues	32,267	28,054
Depreciation and amortization	1,021	918
Operating income (loss)	653	623
Total assets	83,858	67,165
Eliminations
Segment Reporting Information [Line Items]
Revenues	(33,376)	(31,439)
Eliminations | Eastern
Segment Reporting Information [Line Items]
Revenues	10,771	11,306
Eliminations | Western
Segment Reporting Information [Line Items]
Revenues	20,101	18,631
Eliminations | Recycling
Segment Reporting Information [Line Items]
Revenues	1,971	1,185
Eliminations | Other
Segment Reporting Information [Line Items]
Revenues	$ 533	$ 317