Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Senior notes	$ 4,500,000	$ 3,775,000
Acquisition obligations and other notes payable	70,645	69,045
Capital lease obligations	283,185	218,097
Total debt principal outstanding	9,226,330	8,519,642
Discount and deferred financing costs	(95,985)	(100,864)
Carrying Amount of Long-Term Debt, Net of Unamortized Discount or Premium, Current and Noncurrent, Total	9,130,345	8,418,778
Less current portion	(129,037)	(120,154)
Long-term debt	9,001,308	8,298,624
Term Loan A
Debt Instrument [Line Items]
Senior Secured Credit Facilities	925,000	975,000
Term Loan B
Debt Instrument [Line Items]
Senior Secured Credit Facilities	$ 3,447,500	$ 3,482,500