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Intangible and Other Assets Net - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Intangible Assets by Major Class [Line Items]    
Cost incurred to renew or extend term for domain names $ 460,000  
Weighted average renewal period for registration fees 1 year  
Amortization expense for internet domains 88,000 69,000
Estimated amortization expense based on current amount of domains, remainder of 2014 121,000  
Estimated amortization expense based on current amount of domains, 2015 53,000  
Estimated amortization expense based on current amount of domains, 2016 10,000  
Estimated amortization expense based on current amount of domains, thereafter $ 0