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Schedule of Assets and Liabilities Carried at Fair Value (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Assets:    
Available-for-sale securities $ 254,823,000 $ 254,388,000
Fair Value, Measurements, Recurring
    
Assets:    
Cash equivalents 1,583,046,000 1,349,647,000
Interest rate swaps 11,146,000 10,308,000
Restricted cash   199,936,000
Available-for-sale securities 254,823,000 254,388,000
Liabilities:    
Redemption Note 1,936,443,000 1,936,443,000
Fair Value, Measurements, Recurring | Quoted Market Prices in Active Markets (Level 1)
    
Assets:    
Cash equivalents 205,000 220,923,000
Interest rate swaps 0 0
Restricted cash   0
Available-for-sale securities 0 0
Liabilities:    
Redemption Note 0 0
Fair Value, Measurements, Recurring | Other Observable Inputs (Level 2)
    
Assets:    
Cash equivalents 1,582,841,000 1,128,724,000
Interest rate swaps 11,146,000 10,308,000
Restricted cash   199,936,000
Available-for-sale securities 254,823,000 254,388,000
Liabilities:    
Redemption Note $ 1,936,443,000 $ 1,936,443,000