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Reconciliation of Weighted Average Shares Outstanding and Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Net income attributable to XO Group Inc. $ 3,138 $ 2,916 $ 3,535 $ 2,211
Total weighted-average basic shares 24,488 29,495 25,004 30,667
Total weighted-average diluted shares 25,078 30,161 25,585 31,385
Net income per share:        
Basic $ 0.13 $ 0.10 $ 0.14 $ 0.07
Diluted $ 0.13 $ 0.10 $ 0.14 $ 0.07
Restricted stock
       
Earnings Per Share Disclosure [Line Items]        
Dilutive securities 456 519 453 566
Employee Stock Purchase Plan
       
Earnings Per Share Disclosure [Line Items]        
Dilutive securities 12 12 10 10
Options/warrants
       
Earnings Per Share Disclosure [Line Items]        
Dilutive securities 122 135 118 142