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Components of Net Financing Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Components Net Financing Leases [Line Items]    
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received $ 503,447 $ 520,226
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property 129,927 134,194
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs 6,966 6,691
Capital Leases, Net Investment in Direct Financing Leases, Deferred Income 93,157 97,244
Capital Leases, Investment In Direct Financing Leases 547,183 563,867
Capital Leases, Net Investment in Direct Financing Leases, Allowance for Uncollectible Minimum Lease Payments 3,475 4,891
Capital Leases, Net Investment in Direct Financing Leases, Total $ 543,708 $ 558,976