Summary of Total Reserves Included in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables Net Current [Abstract]
Reduction to accounts receivable	$ 8,352	$ 6,254
Component of accrued expenses	42,618	45,249
Total reserves	$ 50,970	$ 51,503	$ 28,510