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Summary of Significant Accounting Policies - Summary of Financing Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Other loan receivables    
Loans to equity accounted investees and joint venture partners $ 206,903 $ 85,248
Total direct financing leases and other loan receivables 833,964 734,558
Payment activity [Member] | Performing [Member]
   
Summary of financing receivables    
Direct financing leases 436,601 459,908
Other loan receivables    
Long term receivable included in other assets 1,704 786
Collateral [Member]
   
Other loan receivables    
Investment in term loans and interest receivable 69,371   
Collateral [Member] | Performing [Member]
   
Other loan receivables    
Investment in term loans and interest receivable 119,385 188,616
Other internal metrics [Member] | Performing [Member]
   
Other loan receivables    
Loans to equity accounted investees and joint venture partners $ 206,903 $ 85,248