Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 23,889	$ 22,446
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired		214
Additions to property, plant and equipment	(16,311)	(23,305)
Payments on landfill operating lease contracts	(1,425)	(1,526)
Payments related to investments		(84)
Proceeds from sale of property and equipment	259	448
Net cash used in investing activities	(11,596)	(24,519)
Proceeds from divestiture transactions	5,335
Proceeds from property insurance settlement	546
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	231,728	89,760
Principal payments on long-term debt	(239,340)	(87,258)
Payments of financing costs	(8,063)	(18)
Excess tax benefit on the vesting of share based awards	153	60
Proceeds from the exercise of share based awards		286
Net cash (used in) provided by financing activities	(11,340)	2,830
Change in restricted cash	5,677
Distributions to noncontrolling interest holder	(1,495)
Net cash provided by (used in) discontinued operations		174
Net increase (decrease) in cash and cash equivalents	953	931
Cash and cash equivalents, beginning of period	2,205	2,695
Cash and cash equivalents, end of period	3,158	3,626
Acquisition [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(16,311)	(266)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	8,025	2,024
Cash Flows from Investing Activities:
Additions to property, plant and equipment		(469)
Payments related to investments		(84)
Net cash used in investing activities	(990)	(553)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	231,710	89,760
Principal payments on long-term debt	(238,846)	(86,801)
Payments of financing costs	(8,063)	(18)
Excess tax benefit on the vesting of share based awards	153	60
Proceeds from the exercise of share based awards		286
Intercompany borrowings	3,374	(3,782)
Net cash (used in) provided by financing activities	(5,995)	(495)
Change in restricted cash	5,677
Net increase (decrease) in cash and cash equivalents	1,040	976
Cash and cash equivalents, beginning of period	1,596	2,312
Cash and cash equivalents, end of period	2,636	3,288
Parent [Member] | Acquisition [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(990)
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	16,362	20,610
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired		214
Additions to property, plant and equipment		(22,836)
Payments on landfill operating lease contracts	(1,425)	(1,526)
Payments related to investments	1,555	(158)
Proceeds from sale of property and equipment	259	448
Net cash used in investing activities	(12,551)	(24,124)
Proceeds from divestiture transactions	1,835
Proceeds from property insurance settlement	546
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	18
Principal payments on long-term debt	(494)	(457)
Intercompany borrowings	(3,374)	3,782
Net cash (used in) provided by financing activities	(3,850)	3,325
Net cash provided by (used in) discontinued operations		174
Net increase (decrease) in cash and cash equivalents	(39)	(15)
Cash and cash equivalents, beginning of period	253	243
Cash and cash equivalents, end of period	214	228
Guarantors [Member] | Acquisition [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(15,321)	(266)
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(498)	(188)
Cash Flows from Investing Activities:
Payments related to investments	(1,555)	158
Net cash used in investing activities	1,945	158
Proceeds from divestiture transactions	3,500
Cash Flows from Financing Activities:
Net cash (used in) provided by financing activities	(1,495)
Distributions to noncontrolling interest holder	(1,495)
Net increase (decrease) in cash and cash equivalents	(48)	(30)
Cash and cash equivalents, beginning of period	356	140
Cash and cash equivalents, end of period	$ 308	$ 110