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Intangible Assets from Acquisitions - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Acquisition Goodwill And Other Intangible Assets [Line Items]        
Amortization expense for intangible assets $ 709,000 [1] $ 1,055,000 [1] $ 2,500,000 [1] $ 3,674,000 [1]
Estimated amortization expense, remainder of 2013 427,000   427,000  
Estimated amortization expense, 2014 433,000   433,000  
Estimated amortization expense, thereafter $ 0   $ 0  
[1] Components of amortization of intangible assets from acquisitions: Service costs $ 2,737 $ 1,579 $ 748 $ 402 Sales and marketing 921 921 307 307 General and administrative 16 - - - Total $ 3,674 $ 2,500 $ 1,055 $ 709