Commitments and Contingencies (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Oct. 31, 2001	Sep. 30, 2019
Commitment Contingencies And Guarantees [Line Items]
Annual payments	$ 650
LTIP liability		$ 300
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		$ 4,000
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		1,000
Private equity funds
Commitment Contingencies And Guarantees [Line Items]
Company outstanding guarantees		$ 3,800