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Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Condensed Financial Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities $ 38,286 $ 70,507 $ 49,642 $ 43,906
Cash Flows from Investing Activities:        
Acquisitions, net of cash acquired (360)   (8,305) (25,225)
Acquisition related additions to property, plant and equipment (45)   (2,633) (1,746)
Additions to property, plant and equipment (55,016) (49,995) (43,326) (53,281)
Payments on landfill operating lease contracts (4,739) (5,385) (6,505) (6,261)
Payment for capital related to divestiture       (618)
Proceeds from divestiture transactions   5,335    
Proceeds from sale of property and equipment 463 715 1,524 883
Proceeds from property insurance settlement   546    
Proceeds from sale of equity method investment     3,442  
Payments related to investments     (2,107) (3,207)
Net cash provided by (used in) investing activities (59,697) (48,784) (57,910) (89,455)
Cash Flows from Financing Activities:        
Proceeds from long-term borrowings 136,800 355,229 161,650 376,346
Principal payments on long-term debt (109,281) (370,996) (152,380) (360,858)
Change in restricted cash (5,819) 4,471    
Payments of financing costs (2,605) (9,025) (405) (4,609)
Payments of debt extinguishment costs   (146)   (10,743)
Proceeds from the exercise of share based awards 143 161 143  
Excess tax benefit on the vesting of share based awards 84 185   96
Net proceeds from the issuance of class A common stock       42,184
Contributions from (distributions to) noncontrolling interest holder   (1,495)   2,531
Net cash (used in) provided by financing activities 19,322 (21,616) 9,008 44,947
Net cash provided by (used in) discontinued operations 1,830   (31) (2,177)
Discontinued operations:        
Net cash provided by (used in) discontinued operations 1,830   (31) (2,177)
Net increase (decrease) in cash and cash equivalents (259) 107 709 (2,779)
Cash and cash equivalents, beginning of period 2,464 2,205 1,755 4,534
Cash and cash equivalents, end of period 2,205 2,312 2,464 1,755
Parent [Member]        
Condensed Financial Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities (27,340) 15,543 (40,365) (5,319)
Cash Flows from Investing Activities:        
Additions to property, plant and equipment (1,433) (2,146) (1,675) (203)
Proceeds from sale of equity method investment     3,442  
Payments related to investments     (2,107) (4,166)
Net cash provided by (used in) investing activities (1,433) (2,146) (340) (4,369)
Cash Flows from Financing Activities:        
Proceeds from long-term borrowings 136,800 351,946 160,487 376,185
Principal payments on long-term debt (108,917) (369,368) (151,074) (359,342)
Change in restricted cash (5,819) 4,471    
Payments of financing costs (2,605) (9,025) (405) (4,609)
Payments of debt extinguishment costs   (146)   (10,743)
Proceeds from the exercise of share based awards 143 161    
Excess tax benefit on the vesting of share based awards 84 185   96
Net proceeds from the issuance of class A common stock       42,184
Intercompany borrowings 8,532 8,722 32,588 (36,622)
Net cash (used in) provided by financing activities 28,218 (13,054) 41,596 7,149
Discontinued operations:        
Net increase (decrease) in cash and cash equivalents (555) 343 891 (2,539)
Cash and cash equivalents, beginning of period 2,151 1,596 1,260 3,799
Cash and cash equivalents, end of period 1,596 1,939 2,151 1,260
Guarantors [Member]        
Condensed Financial Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities 65,622 55,649 89,792 50,527
Cash Flows from Investing Activities:        
Acquisitions, net of cash acquired (360)   (8,305) (25,225)
Acquisition related additions to property, plant and equipment (45)   (2,633) (1,746)
Additions to property, plant and equipment (53,583) (47,849) (41,236) (48,058)
Payments on landfill operating lease contracts (4,739) (5,385) (6,505) (6,261)
Payment for capital related to divestiture       (618)
Proceeds from divestiture transactions   1,835    
Proceeds from sale of property and equipment 463 715 1,524 883
Proceeds from property insurance settlement   546    
Payments related to investments (310) 1,555   (2,707)
Net cash provided by (used in) investing activities (58,574) (48,583) (57,155) (83,732)
Cash Flows from Financing Activities:        
Proceeds from long-term borrowings   3,283 1,163 161
Principal payments on long-term debt (364) (1,628) (1,306) (1,516)
Proceeds from the exercise of share based awards     143  
Intercompany borrowings (8,532) (8,722) (32,588) 36,622
Net cash (used in) provided by financing activities (8,896) (7,067) (32,588) 35,267
Net cash provided by (used in) discontinued operations 1,830   (31) (2,177)
Discontinued operations:        
Net cash provided by (used in) discontinued operations 1,830   (31) (2,177)
Net increase (decrease) in cash and cash equivalents (18) (1) 18 (115)
Cash and cash equivalents, beginning of period 271 253 253 368
Cash and cash equivalents, end of period 253 252 271 253
Non-Guarantors [Member]        
Condensed Financial Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities 4 (685) 215 (1,302)
Cash Flows from Investing Activities:        
Additions to property, plant and equipment     (415) (5,020)
Proceeds from divestiture transactions   3,500    
Payments related to investments 310 (1,555)   3,666
Net cash provided by (used in) investing activities 310 1,945 (415) (1,354)
Cash Flows from Financing Activities:        
Contributions from (distributions to) noncontrolling interest holder   (1,495)   2,531
Net cash (used in) provided by financing activities   (1,495)   2,531
Discontinued operations:        
Net increase (decrease) in cash and cash equivalents 314 (235) (200) (125)
Cash and cash equivalents, beginning of period 42 356 242 367
Cash and cash equivalents, end of period $ 356 $ 121 $ 42 $ 242