Acquisitions - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
	May 23, 2012	Jun. 30, 2012	Jun. 30, 2012
Business Acquisition [Line Items]
Expected tax goodwill		$ 9,678	$ 9,678
Percent of tax basis of acquired goodwill amortized at a rate of 7%			75.00%
Goodwill amortization rate			7.00%
Thoughtcorp Inc
Business Acquisition [Line Items]
Business acquisition, cash paid	7,596
Business acquisition, common stock	217,274
Fair value of shares at the time of issuance	3,607
Period in escrow	18 months
Estimated value of shares issued	3,607
Revenue of acquiree included in consolidated statements of income		1,093	1,093
Net income of acquiree included in consolidated statements of income		14	14
Thoughtcorp Inc | Sales, general and administrative | Stock Based Compensation Expense and Bonuses
Business Acquisition [Line Items]
Acquisition related costs		222	222
Thoughtcorp Inc | Sales, general and administrative | Professional Fees
Business Acquisition [Line Items]
Acquisition related costs		$ 307	$ 366
Thoughtcorp Inc | Non Vested Stock
Business Acquisition [Line Items]
Issuance of restricted common stock	217,272
Vesting period	2 years