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Restructuring Charges (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
office
Restructuring and Related Activities [Abstract]      
Restructuring charges $ 4,065 $ 5,101 $ 26,811
Number of offices closed | office     2
Restructuring liabilities $ 800 $ 1,300