Restructuring and Other Charges - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) position	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 2)	$ 13,846	$ 13,247	$ 17,632
Restructuring charges	13,800	13,200	17,900
Restructuring Reserve, Accrual Adjustment	(700)	(600)	(300)
Americas
Restructuring Cost and Reserve [Line Items]
Restructuring charges	500	2,300	13,000
Restructuring Reserve, Accrual Adjustment	(100)	(300)	(200)
International
Restructuring Cost and Reserve [Line Items]
Restructuring charges	12,700	5,600	4,900
Restructuring Reserve, Accrual Adjustment	(600)	(300)	(100)
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	600	5,300	0
Restructuring Reserve, Accrual Adjustment	$ 0	$ 0	$ 0
Staff Reductions
Restructuring Cost and Reserve [Line Items]
Reduction in headcount	99	45	155
Staff Reductions | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 2)	$ 500	$ 2,300	$ 13,000
Reduction in headcount	12	8	90
Staff Reductions | International
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 2)	$ 12,700	$ 5,600	$ 4,900
Reduction in headcount	87	34	65
Staff Reductions | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 2)	$ 600
Reduction in headcount		3
Special Termination Benefits | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 2)			$ 11,400