Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended			36 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
Current:
U.S. federal	$ 3,876,000	$ 4,755,000	$ 485,000
Foreign	344,000	87,000	116,000
State and local	1,061,000	1,301,000	1,077,000
Total current	5,281,000	6,143,000	1,678,000
Deferred:
U.S. federal	(7,000)	(445,000)	2,430,000
Foreign	2,000	0	0
State and local	(435,000)	(40,000)	(83,000)
Total deferred	(440,000)	(485,000)	2,347,000
Provision for income taxes	4,841,000	5,658,000	4,025,000
Income taxes at federal statutory rate	3,722,000	4,980,000	3,506,000
State income taxes, net of federal benefit	625,000	793,000	656,000
Domestic production activities deduction	(264,000)	(236,000)	(151,000)
Nondeductible expenses	352,000	122,000	158,000
State rate change	(34,000)	0	0
Foreign rate differential	(102,000)	(44,000)	(45,000)	78,000
Income tax reserve	690,000	0	0
Return to provision	275,000	0	0
Other	(423,000)	43,000	(99,000)
Deferred tax assets:
Net operating loss and tax credit carryforwards	16,387,000	17,627,000		17,627,000
Stock-based compensation	2,974,000	2,265,000		2,265,000
Accrued expenses	134,000	201,000		201,000
Allowance for doubtful accounts and other reserves	1,021,000	832,000		832,000
Deferred rent	2,891,000	2,903,000		2,903,000
Other	844,000	363,000		363,000
Total deferred tax assets	24,251,000	24,191,000		24,191,000
Deferred tax liabilities:
Intangible assets	(1,872,000)	(2,113,000)		(2,113,000)
Property and equipment	(1,867,000)	(374,000)		(374,000)
Capitalized software costs	(768,000)	(304,000)		(304,000)
Total deferred tax liabilities	(4,507,000)	(2,791,000)		(2,791,000)
Net deferred tax assets	19,744,000	21,400,000		21,400,000
Current deferred tax assets	2,800,000	2,900,000		2,900,000
Non-current deferred tax assets	21,400,000	21,200,000		21,200,000
Non-current deferred tax liabilities	4,500,000	2,800,000		2,800,000
Net operating loss carryforwards	53,400,000
Net operating loss carryforwards future taxable income offset limitation	3,600,000
Unrecognized tax benefits related to net operating loss	5,100,000
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward Recorded in Other Long-tern Liabilities	3,800,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balances of unrecognized tax benefits as of January 1	4,403,000	4,403,000
Increases for positions taken in prior years	426,000	0
Increases for positions related to the current year	264,000	0
Amounts of decreases related to the settlements	0	0
Reductions due to lapse of statutes of limitations	0	0
Balance of unrecognized tax benefits as of December 31	5,093,000	4,403,000	4,403,000	4,403,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax penalties and interest expense	172,000
Income tax penalties and interest accrued	119,000
Foreign Tax Authority
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax penalties and interest expense	$ 87,000