Organization, Business and Summary of Significant Accounting Policies (Reconciliation of Final Capping, Closure and Post-Closure Liability Balance) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Organization, Business and Summary of Significant Accounting Policies [Abstract]
Final capping, closure and post-closure liability at the beginning of the period	$ 61,500	$ 50,128
Adjustments to final capping, closure and post-closure liabilities	89	4,176
Liabilities incurred	4,690	3,846
Accretion expense associated with landfill obligations	3,759	3,408
Closure payments	(72)	(178)
Assumption of closure liabilities from acquisitions	8,647	120
Final capping, closure and post-closure liability at the end of the period	$ 78,613	$ 61,500