Costs Associated with Exit or Disposal Activities - Additional Information (Detail) - Americas [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 Seat
Restructuring Cost And Reserve [Line Items]
Total cash payment related to restructuring	$ 12.3
2018 Exit Plan [Member]
Restructuring Cost And Reserve [Line Items]
Reduction in number of seats | Seat		5,000
Total cash payment related to restructuring	$ 10.4
Lease termination date	Jun. 30, 2021
2019 Exit Plan [Member]
Restructuring Cost And Reserve [Line Items]
Total cash payment related to restructuring	$ 1.9