Costs Associated with Exit or Disposal Activities - Additional Information (Detail) - Americas [Member] $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2018 Seat
Restructuring Cost And Reserve [Line Items]
Total cash payment related to restructuring	$ 12.8
2018 Exit Plan [Member]
Restructuring Cost And Reserve [Line Items]
Reduction in number of seats | Seat		5,000
Total cash payment related to restructuring	10.5
2019 Exit Plan [Member]
Restructuring Cost And Reserve [Line Items]
Total cash payment related to restructuring	$ 2.3