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Restructuring - Schedule of Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Restructuring And Related Activities [Abstract]          
Balance at beginning of period $ 1,521   $ 4,186 $ 1,568 $ 1,568
Plus: Amounts charged to cost and expense   $ 1,903 309 $ 3,648 6,229
Less: Amounts paid (42)   (3,016)   (3,611)
Balance at end of period $ 1,479   $ 1,479   $ 4,186