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Commitments and Contingencies - Future Minimum Annual Rental Commitments under Operating Leases (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2016 $ 9,011
2017 8,075
2018 6,846
2019 6,157
2020 3,587
Thereafter $ 13,744