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Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Non-Cancellable Operating Lease Agreements (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Office Space Buildings And Equipment  
Other Commitments [Line Items]  
2017 $ 6,875
2018 5,611
2019 5,316
2020 5,223
2021 4,655
Thereafter 5,027
Future minimum lease payments under non-cancellable operating lease agreements 32,707
Ground Leases  
Other Commitments [Line Items]  
2017 2,239
2018 2,239
2019 2,239
2020 2,239
2021 2,239
Thereafter 74,992
Future minimum lease payments under non-cancellable operating lease agreements $ 86,187