Restructuring - Schedule of Reconciliation of Restructuring Liability (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Restructuring And Related Activities [Abstract]
Balance at beginning of period	$ 358		$ 1,568	$ 185	$ 185
Plus: Amounts charged to expense	1,903	$ 1,195	3,648	$ 4,658	6,014
Less: Amounts paid	(542)		(3,497)		(4,631)
Balance at end of period	$ 1,719		$ 1,719		$ 1,568