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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 143,795 | $ 151,133 | $ 144,670 | $ 125,432 | $ 140,024 | $ 146,185 | $ 143,714 | $ 116,577 | $ 368,374 | $ 565,030 | $ 546,500 | $ 497,633
Inter-company revenue |  |  |  |  |  |  |  |  |  | 0 | 0 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 41,485 | 61,856 | 62,704 | 60,339
Operating income | 9,997 | $ 17,378 | $ 15,596 | $ 1,974 | 4,702 | $ 12,696 | $ 11,342 | $ 3,126 | 22,110 | 44,945 | 31,866 | 11,916
Interest expense, net |  |  |  |  |  |  |  |  | 25,392 | 38,652 | 40,090 | 37,863
Capital expenditures |  |  |  |  |  |  |  |  | 55,061 | 54,238 | 49,995 | 45,959
Goodwill | 119,899 |  |  |  | 118,976 |  |  |  | 119,170 | 119,899 | 118,976 | 119,139
Total assets | 631,512 |  |  |  | 633,669 |  |  |  | 658,199 | 631,512 | 633,669 | 638,285
Eastern |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 17,429 |  |  |  | 17,429 |  |  |  | 17,429 | 17,429 | 17,429 |
Western |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 88,426 |  |  |  | 87,503 |  |  |  | 87,697 | 88,426 | 87,503 |
Recycling |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 12,315 |  |  |  | 12,315 |  |  |  | 12,315 | 12,315 | 12,315 |
Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,729 |  |  |  | 1,729 |  |  |  | 1,729 | 1,729 | 1,729 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 1,729
Operating Segments | Eastern |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 108,423 | 176,539 | 167,467 | 147,330
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,195 | 27,036 | 25,977 | 24,961
Operating income |  |  |  |  |  |  |  |  | 3,434 | 9,697 | 7,338 | (1,105)
Interest expense, net |  |  |  |  |  |  |  |  | (315) | (16) | (200) | (272)
Capital expenditures |  |  |  |  |  |  |  |  | 27,354 | 18,363 | 24,840 | 19,870
Goodwill | 17,429 |  |  |  | 17,429 |  |  |  | 17,429 | 17,429 | 17,429 | 17,429
Total assets | 202,420 |  |  |  | 212,922 |  |  |  | 211,020 | 202,420 | 212,922 | 200,235
Operating Segments | Western |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 156,877 | 233,168 | 231,951 | 216,911
Depreciation and amortization |  |  |  |  |  |  |  |  | 19,775 | 27,511 | 29,488 | 28,693
Operating income |  |  |  |  |  |  |  |  | 18,840 | 30,576 | 26,035 | 13,298
Interest expense, net |  |  |  |  |  |  |  |  | (6) | (248) | 165 | 112
Capital expenditures |  |  |  |  |  |  |  |  | 21,884 | 31,637 | 20,282 | 20,471
Goodwill | 88,426 |  |  |  | 87,503 |  |  |  | 87,697 | 88,426 | 87,503 | 87,666
Total assets | 327,628 |  |  |  | 318,730 |  |  |  | 333,028 | 327,628 | 318,730 | 331,304
Operating Segments | Recycling |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 33,741 | 52,911 | 46,338 | 43,825
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,876 | 4,212 | 4,480 | 4,262
Operating income |  |  |  |  |  |  |  |  | (238) | 2,542 | (2,406) | (2,435)
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 156 | 25 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 3,016 | 2,218 | 1,770 | 1,111
Goodwill | 12,316 |  |  |  | 12,315 |  |  |  | 12,315 | 12,316 | 12,315 | 12,315
Total assets | 49,931 |  |  |  | 49,355 |  |  |  | 52,016 | 49,931 | 49,355 | 49,652
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 69,333 | 102,412 | 100,744 | 89,567
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,639 | 3,097 | 2,759 | 2,423
Operating income |  |  |  |  |  |  |  |  | 74 | 2,130 | 899 | 2,158
Interest expense, net |  |  |  |  |  |  |  |  | 25,713 | 38,760 | 40,100 | 38,023
Capital expenditures |  |  |  |  |  |  |  |  | 2,807 | 2,020 | 3,103 | 4,507
Goodwill | 1,728 |  |  |  | 1,729 |  |  |  | 1,729 | 1,728 | 1,729 |
Total assets | 51,533 |  |  |  | 52,662 |  |  |  | 62,135 | 51,533 | 52,662 | 57,094
Elimination |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0 |
Inter-company revenue |  |  |  |  |  |  |  |  | (83,663) | (116,331) | (113,853) | (111,635)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Operating income |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Goodwill | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 | 0
Total assets | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 | 0 | 0
Elimination | Eastern |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inter-company revenue |  |  |  |  |  |  |  |  | 31,840 | 45,728 | 43,560 | 38,946
Elimination | Western |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inter-company revenue |  |  |  |  |  |  |  |  | 50,235 | 67,985 | 68,284 | 70,809
Elimination | Recycling |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inter-company revenue |  |  |  |  |  |  |  |  | (175) | 1,003 | 995 | (139)
Elimination | Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inter-company revenue |  |  |  |  |  |  |  |  | $ 1,763 | $ 1,615 | $ 1,014 | $ 2,019

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