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Commitments and Contingencies - Future Minimum Rental Payments Under Non-Cancelable Ground and Operating Leases (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Commitments and Contingencies Disclosure [Abstract] |
Minimum sublease rentals due in the future under non-cancelable subleases | $ 5,359 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals

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- Details
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Namespace Prefix: | us-gaap_
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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant