Commitments and Contingencies (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2001	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2017
Commitment Contingencies And Guarantees [Line Items]
Other long-term liabilities		$ 2,039		$ 2,804
Annual payments	$ 650
Severance costs				$ 3,900
Minimum
Commitment Contingencies And Guarantees [Line Items]
Bonus pool percent		1.00%
Maximum
Commitment Contingencies And Guarantees [Line Items]
Bonus pool percent		1.333%
Employee Severance
Commitment Contingencies And Guarantees [Line Items]
Maximum severance payments		$ 4,800
Scenario, Forecast
Commitment Contingencies And Guarantees [Line Items]
Severance costs			$ 500
Accrued expenses and other current liabilities
Commitment Contingencies And Guarantees [Line Items]
Liability to former chairman and chief executive officer, current		800
Other long-term liabilities
Commitment Contingencies And Guarantees [Line Items]
Liability to former chairman and chief executive officer, non-current		1,200
Clawback Liability
Commitment Contingencies And Guarantees [Line Items]
Other long-term liabilities		$ 300
Company's ownership in the funds		19.00%
Clawback liability paid					$ 1,000
Private equity funds
Commitment Contingencies And Guarantees [Line Items]
Company outstanding guarantees		$ 3,800