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Nature of Operations	12 Months Ended
Nature of Operations	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations XO Group Inc.’s ("the Company") mission is to help people navigate and truly enjoy life’s biggest moments together. The Company’s multi-platform brands guide couples through transformative life stages - from getting married, to having a baby - and include The Knot, The Bump, and GigMasters. The Company offers content and marketing solutions, targeted advertising programs, transactions and merchandise.