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Lease Agreements - Future Contractual Payments Under Noncancelable Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Leases [Abstract]  
2015 $ 152,661us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
2016 135,703us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
2017 116,025us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
2018 96,439us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
2019 73,626us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
Thereafter 275,551us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter
Total future contractual payments $ 850,005us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable