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Real Estate and Loans Receivable - Components of Net Investment in Direct Financing Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Business Combinations [Abstract]    
Minimum lease payments receivable $ 1,647,567  
Estimated residual values 211,863  
Less unearned income (1,428,406)  
Net investment in direct financing leases $ 431,024 $ 314,412