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Restructuring Charges (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
office
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
office
Dec. 31, 2016
USD ($)
Restructuring and Related Activities [Abstract]          
Restructuring charges $ 0 $ 5,818 $ 2,176 $ 19,804  
Number of offices closed | office   2   2  
Restructuring liability $ 2,500   $ 2,500   $ 5,600