Summary of Total Reserves Included in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Receivables Net Current [Abstract]
Reduction to accounts receivable	$ 7,421	$ 8,352
Component of accrued expenses	48,448	42,618
Total reserves	$ 55,869	$ 50,970	$ 50,868	$ 51,503