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Commitments and Contingencies (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]    
Rent expense of office facilities and real estate $ 2.0 $ 2.0
Rent expense for telecommunications and other equipment $ 1.5 $ 1.5