|
Intangible and Other Assets Net - Additional Information (Detail) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Intangible Assets by Major Class [Line Items] | |||
| Cost incurred to renew or extend term for domain names | $ 2,700,000 | $ 2,700,000 | |
| Weighted average renewal period for registration fees | 1 year | ||
| Amortization expense for internet domains | 239,000 | 336,000 | 520,000 |
| Estimated amortization expense based on current amount of domains, 2015 | 103,000 | ||
| Estimated amortization expense based on current amount of domains, 2016 | 5,000 | ||
| Estimated amortization expense based on current amount of domains, thereafter | $ 0 | ||