Summary of Fair Value of Level 3 Financial Liabilities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value at the beginning of the period	$ 5,200
Additions of contingent consideration	600
Changes in estimated fair value	45,000
Fair value at the end of the period	50,800
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value at the beginning of the period	5,200
Additions of contingent consideration	600
Changes in estimated fair value	45,000
Fair value at the end of the period	$ 50,800