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Intangible and Other Assets Net (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Schedule of Intangible Assets Disclosure [Line Items] |  |
Internet domain names | $ 14,613 | $ 14,910
Less accumulated amortization | (14,393) | (14,590)
Internet domain names, net | 220 | 320
Registration fees, net | 68 | 9
Other | 281 | 282
Total intangibles and other assets, net | $ 569 | $ 611

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