XML 65 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1
Restructuring and Other Charges - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges $ 17,632 $ 5,694 $ 12,258
Restructuring Reserve, Accrual Adjustment $ (300) (1,600)  
Number of employees who accepted the VRIP 83    
International      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Accrual Adjustment $ (100) (600)  
Americas      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Accrual Adjustment (200) (500)  
Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Accrual Adjustment 0 $ (500)  
Special termination benefits      
Restructuring Cost and Reserve [Line Items]      
Non-cash special termination benefit expense $ 11,400    
Staff Reductions      
Restructuring Cost and Reserve [Line Items]      
Reduction in headcount 155 179 216
Staff Reductions | International      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges $ 4,900 $ 5,300 $ 7,400
Reduction in headcount 65 75 134
Staff Reductions | Americas      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges $ 13,000 $ 1,800 $ 3,300
Reduction in headcount 90 103 70
Staff Reductions | Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges   $ 200 $ 1,600
Reduction in headcount   1 12