Commitments and Contingencies (Detail) (USD $)	1 Months Ended	12 Months Ended
	Oct. 31, 2001	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitment Contingencies And Guarantees [Line Items]
Total rental expense under operating leases		$ 600,000	$ 600,000	$ 600,000
Future minimum lease payments under non-cancelable operating leases 2014		400,000
Company outstanding guarantees		3,800,000
Accrued expenses		2,334,000	2,431,000
Other long-term liabilities		3,507,000	3,683,000
Annual payments	650,000
Employee Severance [Member]
Commitment Contingencies And Guarantees [Line Items]
Restructuring and Related Cost, Expected Cost		3,000,000
Letter of credit [Member]
Commitment Contingencies And Guarantees [Line Items]
Letters of credit outstanding		6,300,000
Letter of credit expiration date		Mar. 19, 2019
Accrued expenses and other current liabilities [Member]
Commitment Contingencies And Guarantees [Line Items]
Liability to former chairman and chief executive officer, current		800,000
Other long-term liabilities [Member]
Commitment Contingencies And Guarantees [Line Items]
Liability to former chairman and chief executive officer, non-current		2,500,000
Clawback Liability [Member]
Commitment Contingencies And Guarantees [Line Items]
Accrued expenses and other current liabilities		1,300,000
Accrued expenses		1,000,000
Other long-term liabilities		300,000
Company's ownership in the funds		19.00%
Private equity funds [Member]
Commitment Contingencies And Guarantees [Line Items]
Committed capital of private equity funds		$ 200,000
Funding period		12 months