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Restructuring Charges (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
office
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
office
Dec. 31, 2016
USD ($)
Restructuring and Related Activities [Abstract]          
Restructuring charges $ 2,883 $ 3,117 $ 5,059 $ 22,921  
Number of offices closed | office   2   2  
Restructuring liability $ 1,400   $ 1,400   $ 5,600