Financial Instruments - Summary of Financing Receivables (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other loan receivables
Investment in term loans	$ 188,895	$ 120,642
Total direct financing leases and other loan receivables	799,163	833,964
Payment activity [Member] \| Performing [Member]
Summary of financing receivables
Direct financing leases	430,414	436,601
Other loan receivables
Long term receivable included in other assets		1,704
Collateral [Member] \| Non-Performing [Member]
Other loan receivables
Investment in term loans	188,895	188,756
Other internal metrics [Member] \| Performing [Member]
Other loan receivables
Loans to equity accounted investees and joint venture partners	$ 179,854	$ 206,903

For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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