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Unsecured and Secured Indebtedness - Summary of Carrying Amount of Debt and Equity Balance (Detail) - Senior Convertible Notes [Member]
$ in Thousands
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]  
Carrying value of equity component $ 52,497
Principal amount of senior convertible notes 350,000
Remaining unamortized accretion (9,954)
Net carrying value of senior convertible notes $ 340,046