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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 198,547	$ 172,832	$ 549,670	$ 485,936
Depreciation and amortization	20,940	18,202	58,144	51,572
Operating Income (Loss)	18,485	28,884	38,471	44,871
Total assets	935,780		935,780		$ 732,410
Operating
Segment Reporting Information [Line Items]
Revenues	198,547	172,832	549,670	485,936
Depreciation and amortization	20,940	18,202	58,144	51,572
Operating Income (Loss)	18,485	28,884	38,471	44,871
Total assets	935,780	702,848	935,780	702,848
Operating | Eastern
Segment Reporting Information [Line Items]
Revenues	59,675	56,006	163,748	154,099
Depreciation and amortization	6,386	7,267	18,014	20,276
Operating Income (Loss)	2,121	15,222	5,722	17,675
Total assets	209,123	180,896	209,123	180,896
Operating | Western
Segment Reporting Information [Line Items]
Revenues	92,871	74,425	251,860	210,208
Depreciation and amortization	12,620	8,844	34,279	25,226
Operating Income (Loss)	15,148	13,927	30,849	33,104
Total assets	596,765	402,931	596,765	402,931
Operating | Recycling
Segment Reporting Information [Line Items]
Revenues	10,726	10,877	32,006	30,634
Depreciation and amortization	1,028	1,131	2,975	3,228
Operating Income (Loss)	145	(516)	(1,010)	(7,933)
Total assets	57,216	48,995	57,216	48,995
Operating | Other
Segment Reporting Information [Line Items]
Revenues	35,275	31,524	102,056	90,995
Depreciation and amortization	906	960	2,876	2,842
Operating Income (Loss)	1,071	251	2,910	2,025
Total assets	72,676	70,026	72,676	70,026
Inter-company revenues
Segment Reporting Information [Line Items]
Revenues	(45,005)	(37,363)	(120,297)	(106,401)
Inter-company revenues | Eastern
Segment Reporting Information [Line Items]
Revenues	15,156	14,557	40,606	40,432
Inter-company revenues | Western
Segment Reporting Information [Line Items]
Revenues	26,645	20,578	70,960	59,898
Inter-company revenues | Recycling
Segment Reporting Information [Line Items]
Revenues	2,486	1,773	6,820	4,697
Inter-company revenues | Other
Segment Reporting Information [Line Items]
Revenues	$ 718	$ 455	$ 1,911	$ 1,374

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