CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net revenue:
Online advertising	$ 89,549us-gaap_AdvertisingRevenue	$ 81,661us-gaap_AdvertisingRevenue	$ 76,475us-gaap_AdvertisingRevenue
Registry services	9,794xoxo_RegistryServicesRevenue	7,926xoxo_RegistryServicesRevenue	6,231xoxo_RegistryServicesRevenue
Merchandise	16,223us-gaap_SalesRevenueGoodsNet	18,406us-gaap_SalesRevenueGoodsNet	21,359us-gaap_SalesRevenueGoodsNet
Publishing and other	28,098xoxo_PublishingRevenue	25,821xoxo_PublishingRevenue	25,066xoxo_PublishingRevenue
Total net revenue	143,664us-gaap_Revenues	133,814us-gaap_Revenues	129,131us-gaap_Revenues
Cost of revenue:
Online advertising	1,770us-gaap_AdvertisingRevenueCost	1,927us-gaap_AdvertisingRevenueCost	1,741us-gaap_AdvertisingRevenueCost
Merchandise	10,914us-gaap_CostOfGoodsSold	11,296us-gaap_CostOfGoodsSold	12,454us-gaap_CostOfGoodsSold
Publishing and other	8,511us-gaap_OtherCostOfServices	9,178us-gaap_OtherCostOfServices	8,407us-gaap_OtherCostOfServices
Total cost of revenue	21,195us-gaap_CostOfRevenue	22,401us-gaap_CostOfRevenue	22,602us-gaap_CostOfRevenue
Gross profit	122,469us-gaap_GrossProfit	111,413us-gaap_GrossProfit	106,529us-gaap_GrossProfit
Operating expenses:
Product and content development	35,820us-gaap_ResearchAndDevelopmentExpense	29,877us-gaap_ResearchAndDevelopmentExpense	26,229us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	44,330us-gaap_SellingAndMarketingExpense	39,718us-gaap_SellingAndMarketingExpense	40,239us-gaap_SellingAndMarketingExpense
General and administrative	25,617us-gaap_GeneralAndAdministrativeExpense	23,073us-gaap_GeneralAndAdministrativeExpense	20,980us-gaap_GeneralAndAdministrativeExpense
Asset impairment charges	836us-gaap_AssetImpairmentCharges	1,430us-gaap_AssetImpairmentCharges	958us-gaap_AssetImpairmentCharges
Depreciation and amortization	6,969us-gaap_DepreciationAndAmortization	4,808us-gaap_DepreciationAndAmortization	3,874us-gaap_DepreciationAndAmortization
Total operating expenses	113,572us-gaap_OperatingExpenses	98,906us-gaap_OperatingExpenses	92,280us-gaap_OperatingExpenses
Income from operations	8,897us-gaap_OperatingIncomeLoss	12,507us-gaap_OperatingIncomeLoss	14,249us-gaap_OperatingIncomeLoss
Loss in equity interests	(232)	(2,016)	(55)
Interest and other income (expense), net	(1,740)us-gaap_OtherNonoperatingIncome	144us-gaap_OtherNonoperatingIncome	113us-gaap_OtherNonoperatingIncome
Income before income taxes	6,925	10,635	14,307
Income tax expense	6,463us-gaap_IncomeTaxExpenseBenefit	4,841us-gaap_IncomeTaxExpenseBenefit	5,658us-gaap_IncomeTaxExpenseBenefit
Net income	462us-gaap_ProfitLoss	5,794us-gaap_ProfitLoss	8,649us-gaap_ProfitLoss
Plus: net loss attributable to noncontrolling interest	0	0	65
Net income attributable to XO Group Inc.	$ 462us-gaap_NetIncomeLoss	$ 5,794us-gaap_NetIncomeLoss	$ 8,714us-gaap_NetIncomeLoss
Net income per share attributable to XO Group Inc. common stockholders:
Basic (usd per share)	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic
Diluted (usd per share)	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted
Weighted average number of shares used in calculating net earnings per share
Basic (shares)	25,210	24,620	24,649
Diluted (shares)	25,589	25,596	25,218
Restricted stock
Weighted average number of shares used in calculating net earnings per share
Dilutive securities (shares)	355	874	444
Employee stock purchase plan
Weighted average number of shares used in calculating net earnings per share
Dilutive securities (shares)	1	6	9
Options
Weighted average number of shares used in calculating net earnings per share
Dilutive securities (shares)	23	96	116

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