Net Income (Loss) Per Share Attributable to HomeAway, Inc. - Common Equivalent Shares Excluded from Calculation of Net Income (Loss) Per Share attributable to HomeAway, Inc as their Inclusion Would have been Anti-Dilutive (Detail)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common equivalent shares excluded from the calculation of net income per share 11,020 8,035
Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common equivalent shares excluded from the calculation of net income per share 3,103 301
Restricted Stock Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common equivalent shares excluded from the calculation of net income per share 201 18
Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common equivalent shares excluded from the calculation of net income per share 7,716 7,716