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Restructuring and Other Charges - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (Note 2) $ 13,247 $ 17,632 $ 5,694
Restructuring Reserve, Accrual Adjustment (600) (300) (1,600)
International      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Accrual Adjustment (300) (100) (600)
Americas      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Accrual Adjustment (300) (200) (500)
Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Accrual Adjustment $ 0 $ 0 $ (500)
Staff Reductions      
Restructuring Cost and Reserve [Line Items]      
Reduction in headcount 45 155 179
Staff Reductions | International      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (Note 2) $ 5,600 $ 4,900 $ 5,300
Reduction in headcount 34 65 75
Staff Reductions | Americas      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (Note 2) $ 2,300 $ 13,000 $ 1,800
Reduction in headcount 8 90 103
Staff Reductions | Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (Note 2) $ 5,300   $ 200
Reduction in headcount 3    
Voluntary Retirement Incentive Package [Member] | Special Termination Benefits [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs   $ 11,400