Income Taxes - Components of Deferred Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Non-deductible reserves and accruals	$ 7,239	$ 3,848
Stock compensation	4,539	4,948
Net operating loss and other carryforwards	10,830	10,398
Gross deferred tax asset	22,608	19,194
Less-valuation allowance	(2,200)	(2,086)	(3,077)	(2,676)
Sub-total	20,408	17,108
Depreciation and amortization	(2,945)	(5,018)
Goodwill amortization	(5,401)	(4,381)
Other liabilities	(2,134)	(2,872)
Deferred commissions	(5,080)	(3,743)
Net deferred tax asset	$ 4,848	$ 1,094