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Segment Reporting - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 144,670 | $ 143,714 | $ 270,103 | $ 260,292 |
Depreciation and amortization | 15,802 | 16,241 | 30,255 | 29,990 |
Operating income (loss) | 15,596 | 11,342 | 17,570 | 14,468 |
Total assets | 631,621 | 640,177 | 631,621 | 640,177 | $ 633,669
Eastern Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization | 7,138 | 6,752 | 13,327 | 11,990 |
Operating income (loss) | 3,079 | 3,186 | 2,291 | 2,700 |
Total assets | 208,316 | 207,507 | 208,316 | 207,507 |
Western Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization | 6,908 | 7,674 | 13,398 | 14,412 |
Operating income (loss) | 10,175 | 7,684 | 13,169 | 12,679 |
Total assets | 319,480 | 323,746 | 319,480 | 323,746 |
Recycling [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization | 1,040 | 1,110 | 2,132 | 2,226 |
Operating income (loss) | 468 | (401) | (606) | (2,411) |
Total assets | 48,782 | 50,457 | 48,782 | 50,457 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization | 716 | 705 | 1,398 | 1,362 |
Operating income (loss) | 1,874 | 873 | 2,716 | 1,500 |
Total assets | 55,043 | 58,467 | 55,043 | 58,467 |
Outside Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 144,670 | 143,714 | 270,103 | 260,292 |
Outside Revenues [Member] | Eastern Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 45,405 | 43,822 | 84,392 | 77,090 |
Outside Revenues [Member] | Western Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 59,460 | 61,686 | 111,922 | 111,043 |
Outside Revenues [Member] | Recycling [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 12,816 | 11,462 | 23,454 | 21,756 |
Outside Revenues [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 26,989 | 26,744 | 50,335 | 50,403 |
Inter-Company Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (30,287) | (30,428) | (55,586) | (53,066) |
Inter-Company Revenue [Member] | Eastern Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 11,692 | 11,401 | 21,229 | 19,417 |
Inter-Company Revenue [Member] | Western Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 17,889 | 18,504 | 32,740 | 32,901 |
Inter-Company Revenue [Member] | Recycling [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 302 | 253 | 933 | 257 |
Inter-Company Revenue [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 404 | $ 270 | $ 684 | $ 491 |

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