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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Inter-company revenues $ 146,185 $ 141,924 $ 406,476 $ 392,400  
Depreciation and amortization 16,385 15,787 46,374 46,562  
Operating income (loss) 12,696 10,623 27,164 6,476  
Total assets 660,665 661,522 660,665 661,522 $ 669,795
Eastern Region [Member]          
Segment Reporting Information [Line Items]          
Depreciation and amortization 6,956 6,721 18,946 18,952  
Operating income (loss) 4,523 2,357 7,224 (1,565)  
Total assets 210,292 207,958 210,292 207,958  
Western Region [Member]          
Segment Reporting Information [Line Items]          
Depreciation and amortization 7,617 7,407 22,029 22,496  
Operating income (loss) 7,792 7,873 20,471 9,035  
Total assets 323,915 332,792 323,915 332,792  
Recycling [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 12,700 13,306 34,456 35,646  
Depreciation and amortization 1,130 1,074 3,356 3,207  
Operating income (loss) 277 413 (2,134) (1,202)  
Total assets 50,038 51,628 50,038 51,628  
Other [Member]          
Segment Reporting Information [Line Items]          
Depreciation and amortization 682 585 2,043 1,907  
Operating income (loss) 104 (20) 1,603 208  
Total assets 76,420 69,144 76,420 69,144  
Outside Revenues [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 146,185 141,924 406,476 392,400  
Outside Revenues [Member] | Eastern Region [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 46,143 42,137 123,233 113,149  
Outside Revenues [Member] | Western Region [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 62,387 60,453 173,429 168,438  
Outside Revenues [Member] | Recycling [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 12,700 13,306 34,456 35,646  
Outside Revenues [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 24,955 26,028 75,358 75,167  
Inter-Company Revenue [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 0 (32,975) 0 (88,403)  
Inter-Company Revenue [Member] | Eastern Region [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 12,531 12,728 31,948 32,923  
Inter-Company Revenue [Member] | Western Region [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 18,236 19,624 51,138 53,871  
Inter-Company Revenue [Member] | Recycling [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues 318 (48) 575 (169)  
Inter-Company Revenue [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Inter-company revenues $ 300 $ 671 $ 791 $ 1,778