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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Revenues $ 160,269 $ 151,133 $ 448,087 $ 421,236  
Depreciation and amortization 16,591 16,175 46,307 46,430  
Operating income (loss) 18,277 17,378 (22,437) 34,947  
Total assets 592,420 635,255 592,420 635,255 $ 631,512
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues     448,087 421,236  
Operating Segments | Eastern          
Segment Reporting Information [Line Items]          
Revenues 49,066 47,238 134,326 131,630  
Depreciation and amortization 6,122 7,291 17,949 20,618  
Operating income (loss) 5,897 4,452 (54,407) 6,742  
Total assets 155,726 206,177 155,726 206,177  
Operating Segments | Western          
Segment Reporting Information [Line Items]          
Revenues 67,992 63,171 186,507 175,093  
Depreciation and amortization 8,572 7,010 22,762 20,409  
Operating income (loss) 11,579 11,392 26,438 24,561  
Total assets 335,373 326,862 335,373 326,862  
Operating Segments | Recycling          
Segment Reporting Information [Line Items]          
Revenues 16,360 14,412 49,206 37,865  
Depreciation and amortization 1,044 1,055 3,066 3,187  
Operating income (loss) 638 1,529 3,285 923  
Total assets 49,471 48,531 49,471 48,531  
Operating Segments | Other          
Segment Reporting Information [Line Items]          
Revenues 26,851 26,312 78,048 76,648  
Depreciation and amortization 853 819 2,530 2,216  
Operating income (loss) 163 5 2,247 2,721  
Total assets 51,850 53,685 51,850 53,685  
Inter-company revenue | Eastern          
Segment Reporting Information [Line Items]          
Revenues 14,296 12,775 37,020 34,003  
Inter-company revenue | Western          
Segment Reporting Information [Line Items]          
Revenues 19,183 18,560 53,590 51,300  
Inter-company revenue | Recycling          
Segment Reporting Information [Line Items]          
Revenues (292) 94 (781) 1,026  
Inter-company revenue | Other          
Segment Reporting Information [Line Items]          
Revenues 531 530 1,516 1,213  
Eliminations          
Segment Reporting Information [Line Items]          
Revenues (33,718) (31,959) (91,345) (87,542)  
Depreciation and amortization 0 0 0 0  
Operating income (loss) 0 0 0 0  
Total assets $ 0 $ 0 $ 0 $ 0