Real Estate and Loans Receivable - Minimum Rental Payments Due under Operating Leases with Non-Cancelable Terms (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Leases User Charges And Commitments [Line Items]
2015	$ 3,415
2016	3,434
2017	3,443
2018	3,436
2019	3,055
Thereafter	84,759
Minimum rental payments, total	101,542
Minimum Rental Payments [Member]
Leases User Charges And Commitments [Line Items]
2015	240,250
2016	242,519
2017	243,946
2018	245,769
2019	246,819
Thereafter	219,089
Minimum rental payments, total	3,438,392
Minimum Rental Payments [Member] \| Operating Leases [Member]
Leases User Charges And Commitments [Line Items]
2015	196,864
2016	198,265
2017	198,807
2018	199,728
2019	199,857
Thereafter	1,838,346
Minimum rental payments, total	2,831,867
Minimum Rental Payments [Member] \| Direct Financing Leases [Member]
Leases User Charges And Commitments [Line Items]
2015	43,386
2016	44,254
2017	45,139
2018	46,041
2019	46,962
Thereafter	380,743
Minimum rental payments, total	$ 606,525

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

+ Details

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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