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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | $ 143,714 | $ 137,279 | $ 260,292 | $ 250,476 |
Depreciation and amortization | 16,241 | 17,167 | 29,990 | 30,775 |
Operating income (loss) | 11,342 | (473) | 14,468 | (4,147) |
Total assets | 657,528 | 657,425 | 657,528 | 657,425 | $ 669,795
Eastern Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | 43,822 | 39,674 | 77,090 | 71,012 |
Depreciation and amortization | 6,752 | 6,903 | 11,990 | 12,231 |
Operating income (loss) | 3,186 | 937 | 2,700 | (3,922) |
Total assets | 207,507 | 204,711 | 207,507 | 204,711 |
Western Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | 61,686 | 59,246 | 111,043 | 107,986 |
Depreciation and amortization | 7,674 | 8,564 | 14,412 | 15,089 |
Operating income (loss) | 7,684 | (1,441) | 12,679 | 1,162 |
Total assets | 323,746 | 331,175 | 323,746 | 331,175 |
Recycling [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | 11,462 | 11,979 | 21,756 | 22,340 |
Depreciation and amortization | 1,110 | 1,067 | 2,226 | 2,133 |
Operating income (loss) | (401) | (131) | (2,411) | (1,615) |
Total assets | 50,457 | 49,570 | 50,457 | 49,570 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | 26,744 | 26,380 | 50,403 | 49,138 |
Depreciation and amortization | 705 | 633 | 1,362 | 1,322 |
Operating income (loss) | 873 | 162 | 1,500 | 228 |
Total assets | 75,818 | 71,969 | 75,818 | 71,969 |
Intersubsegment Eliminations [Member] | Inter-Company Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | (30,428) | (31,014) | (53,066) | (55,427) |
Intersubsegment Eliminations [Member] | Eastern Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | 11,401 | 11,607 | 19,417 | 20,195 |
Intersubsegment Eliminations [Member] | Western Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | 18,504 | 18,863 | 32,901 | 34,247 |
Intersubsegment Eliminations [Member] | Recycling [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | 253 | (58) | 257 | (121) |
Intersubsegment Eliminations [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inter-company revenues | $ 270 | $ 602 | $ 491 | $ 1,106 |

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