Description of Business and Summary of Significant Accounting Policies - Finite-Lived Intangible Assets, Estimated Useful Lives (Details)	3 Months Ended	5 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013
Directory services agreements
Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives			5 years
Client relationships
Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives	3 years	4 years	3 years
Trademarks and domain names
Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives			5 years
Patented technologies
Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives	4 years	5 years	4 years
Advertising commitment
Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives			3 years