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Details of Movement in Restructuring Provisions Recognized (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]      
Initial restructuring charge recorded $ 4,065 $ 4,094 $ 8,159
Cash payments (2,243) (901) (3,144)
Foreign exchange movement     0
Closing provision 5,015 3,193 5,015
Workforce reduction      
Restructuring Cost and Reserve [Line Items]      
Initial restructuring charge recorded 2,096 4,094 6,190
Cash payments (2,243) (901) (3,144)
Foreign exchange movement     0
Closing provision 3,046 $ 3,193 3,046
Office Consolidations      
Restructuring Cost and Reserve [Line Items]      
Initial restructuring charge recorded 1,969   1,969
Foreign exchange movement     0
Closing provision $ 1,969   $ 1,969