Aggregate Net Purchase Price of Facilities Allocated to Assets and Liabilities Based on their Estimated Fair Values (Detail) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 2012 Acquisitions of Assets and Businesses
Business Acquisition [Line Items]
Working capital, net				$ 21,000
Property & equipment				60,000
Goodwill	3,049,016	3,036,765	2,627,602	446,000
Other assets				9,000
Income tax assets, net of deferred tax liabilities				(1,000)
Other liabilities				(7,000)
Cash paid in 2012 for acquisitions				$ 528,000