Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Additional Information (Detail)

v2.4.0.8
Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Payments to acquire domain names and other intangible assets $ 927,000 $ 3,375,000 $ 1,850,000
Amortization of finite-lived intangible assets 16,600,000 18,300,000 16,200,000
Domain Names and Other Intangibles
     
Finite-Lived Intangible Assets [Line Items]      
Payments to acquire domain names and other intangible assets $ 900,000 $ 400,000