Earnings Per Share - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share Disclosure [Line Items]
Net income attributable to XO Group Inc.					$ 3,120	$ 2,059	$ 3,138	$ 397	$ 5,794	$ 8,714	$ 6,040
Total weighted-average basic shares									24,620,000	24,649,000	29,060,000
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Total weighted-average diluted shares									25,596,000	25,218,000	29,692,000
Net income per share attributable to XO Group Inc. common stockholders:
Basic (usd per share)	$ (0.12)	$ 0.13	$ 0.17	$ 0.07	$ 0.13	$ 0.08	$ 0.13	$ 0.02	$ 0.24	$ 0.35	$ 0.21
Diluted (usd per share)	$ (0.12)	$ 0.12	$ 0.16	$ 0.07	$ 0.13	$ 0.08	$ 0.13	$ 0.02	$ 0.23	$ 0.35	$ 0.20
Out of Money
Net income per share attributable to XO Group Inc. common stockholders:
Weighted average number of antidilutive stock options and restricted stock excluded from the calculation of earnings per share (shares)									101,843	41,397	184,300
Restricted stock
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Dilutive securities (shares)									874,000	444,000	491,000
Employee stock purchase plan
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Dilutive securities (shares)									6,000	9,000	10,000
Options
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Dilutive securities (shares)									96,000	116,000	131,000