Restructuring and Separation Costs - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Accrued costs associated with restructuring plan		$ 1,478	$ 14,146
Restructuring and employee separation related costs		5,041	14,146
Payment of accrued costs associated with restructuring plan		12,400
Restructuring a cost description	We incurred $14.1 million in restructuring and employee separation related costs during 2017, including $11.5 million related to the termination of our Brazilian agency agreement. During 2018, we incurred an additional $5.0 million in severance and related costs for redundant employees identified in 2018 in connection with the restructuring plan and paid $12.4 million in previously accrued costs.
Termination of Brazilian Agency Agreement [Member]
Restructuring Cost and Reserve [Line Items]
Accrued costs associated with restructuring plan			$ 11,500
Severance Payments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and employee separation related costs		$ 5,000