Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
U.S. federal	$ 3,382	$ 3,351	$ 3,826
Foreign	(18)	53	525
State and local	639	720	137
Total current	4,003	4,124	4,488
Deferred:
U.S. federal	1,694	3,299	1,012
Foreign	(71)	0	0
State and local	(62)	846	963
Total deferred	1,561	4,145	1,975
Provision for income taxes	5,564	8,269	6,463
Income taxes at federal statutory rate	6,190	4,806	2,424
State income taxes, net of federal benefit	425	1,078	833
Sale of Ijie operations	0	0	1,404
Foreign taxes	(45)	(65)	714
Subpart F income	0	0	570
Income tax reserve and other assessments	(1,281)	286	266
Nondeductible expenses	264	236	252
Provision for foreign unremitted earnings	103	46	221
Domestic production activities deduction	0	0	(236)
Valuation allowance	115	2,190	0
Other	(207)	(308)	15
Provision for income taxes	5,564	8,269	6,463
Deferred tax assets:
Net operating loss and tax credit carryforwards	10,367	11,825
Allowance for doubtful accounts and other reserves	2,218	2,070
Deferred rent	1,726	2,085
Stock-based compensation	2,112	1,721
Equity method investments	2,529	2,525
Other	84	189
Valuation allowance	(2,734)	(2,610)
Total deferred tax assets	16,302	17,805
Deferred tax liabilities:
Unremitted earnings	(371)	(267)
Intangible assets	(1,855)	(1,746)
Property and equipment	(1,518)	(1,840)
Capitalized software costs	(2,640)	(2,374)
Total deferred tax liabilities	(6,384)	(6,227)
Total net deferred tax assets	9,918	11,578
Net operating loss carryforwards	27,100
Net operating loss carryforwards future taxable income offset limitation	3,600
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balances of unrecognized tax benefits as of January 1	3,630	2,176
Increases for positions taken in prior years		1,686
Decreases for positions taken in prior years	(1,330)
Increases for positions related to the current year	69	0
Expiration of the statute of limitations	(264)	(232)
Balance of unrecognized tax benefits as of December 31	2,105	3,630	2,176
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward Recorded in Other Long-term Liabilities	2,100
Income tax penalties and interest expense	0	50	$ 200
Income tax penalties and interest accrued	200	$ 200
Other Noncurrent Liabilities
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward Recorded in Other Long-term Liabilities	$ 1,200