Income Taxes (Components of Deferred Income Tax Assets and Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets:
Accounts receivable reserves	$ 2,968	$ 3,519
Accrued expenses	37,465	34,377
Compensation	16,924	15,549
Interest rate and fuel hedges	7,475	3,479
Leases	990	1,178
State taxes	4,218	5,480
Contingent liabilities	17,636	25,071
Other	1,472	527
Gross deferred income tax assets	$ 89,148	$ 89,180
Less: Valuation allowance
Net deferred income tax assets	$ 89,148	$ 89,180
Deferred income tax liabilities:
Goodwill and other intangibles	(158,093)	(280,828)
Property and equipment	(288,953)	(255,512)
Landfill closure/post-closure	(37,185)	(34,277)
Prepaid expenses	(7,683)	(7,690)
Total deferred income tax liabilities	(491,914)	(578,307)
Net deferred income tax liability	$ (402,766)	$ (489,127)