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Intangible and Other Assets Net - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Intangible Assets by Major Class [Line Items]
Cost incurred to renew or extend term for domain names	$ 583,000		$ 1,800,000
Weighted average renewal period for registration fees			1 year
Amortization expense for internet domains	80,000	76,000	224,000	443,000
Estimated amortization expense based on current amount of domains, 2013	135,000		135,000
Estimated amortization expense based on current amount of domains, 2014	85,000		85,000
Estimated amortization expense based on current amount of domains, thereafter	$ 0		$ 0