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, 2016	Dec. 31, 2015
Organization, Business and Summary of Significant Accounting Policies [Abstract]
Final capping, closure and post-closure liability at the beginning of the period	$ 78,613	$ 61,500
Adjustments to final capping, closure and post-closure liabilities	(6,797)	89
Liabilities incurred	10,922	4,690
Accretion expense associated with landfill obligations	8,699	3,759
Closure payments	(4,609)	(72)
Assumption of closure liabilities from acquisitions	158,081	8,647
Final capping, closure and post-closure liability at the end of the period	$ 244,909	$ 78,613