Income Taxes (Components of Deferred Income Tax Assets and Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred income tax assets:
Accounts receivable reserves	$ 3,519	$ 2,810
Accrued expenses	34,377	31,330
Compensation	15,549	10,901
Interest rate and fuel hedges	3,479	1,158
Leases	1,178	1,308
State taxes	5,480us-gaap_DeferredTaxAssetsStateTaxes	3,917us-gaap_DeferredTaxAssetsStateTaxes
Contingent liabilities	25,071	19,415
Other	527us-gaap_DeferredTaxAssetsOther	723us-gaap_DeferredTaxAssetsOther
Gross deferred income tax assets	89,180us-gaap_DeferredTaxAssetsGross	71,562us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance
Net deferred income tax assets	89,180us-gaap_DeferredTaxAssetsNet	71,562us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:
Goodwill and other intangibles	(280,828)	(247,082)
Property and equipment	(255,512)	(242,556)
Landfill closure/post-closure	(34,277)	(30,085)
Prepaid expenses	(7,690)	(12,256)
Total deferred income tax liabilities	(578,307)us-gaap_DeferredIncomeTaxLiabilities	(531,979)us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax liability	$ (489,127)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (460,417)us-gaap_DeferredTaxAssetsLiabilitiesNet

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