Commitments and Contingencies (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2001	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitment Contingencies And Guarantees [Line Items]
Total rental expense under operating leases		$ 500	$ 600	$ 600
Future minimum payments, 2016		397
Future minimum payments, 2017		584
Future minimum payments, 2018		591
Future minimum payments, 2019		602
Future minimum payments, 2020 and thereafter		3,843
Future minimum payments		6,017
Company outstanding guarantees		3,800
Accrued expenses		2,789	2,334
Other long-term liabilities		3,965	$ 3,507
Annual payments	$ 650
Employee Severance [Member]
Commitment Contingencies And Guarantees [Line Items]
Restructuring and related cost, expected cost		3,000
Credit Arrangements [Member] | Landlord Of Compu Com Systems Incs Dallas Headquarters [Member]
Commitment Contingencies And Guarantees [Line Items]
Letters of credit outstanding		$ 6,300
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
Other long-term liabilities [Member]
Commitment Contingencies And Guarantees [Line Items]
Liability to former chairman and chief executive officer, non-current		2,300
Clawback Liability [Member]
Commitment Contingencies And Guarantees [Line Items]
Accrued expenses and other current liabilities		1,300
Accrued expenses		1,000
Other long-term liabilities		$ 300
Company's ownership in the funds		19.00%