Finite-Lived Intangible Assets, Weighted Average Useful Lives and Amortization Methodology (Details) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Directory Service Agreements	Dec. 31, 2011 Directory Service Agreements	Jun. 30, 2012 Local Customer Relationships	Dec. 31, 2011 Local Customer Relationships	Jun. 30, 2012 National Customer Relationships	Dec. 31, 2011 National Customer Relationships	Jun. 30, 2012 Tradenames and Trademarks	Dec. 31, 2011 Tradenames and Trademarks	Jun. 30, 2012 Technology, Advertising Commitments & Other
Weighted Average Useful Lives:
Finite-Lived Intangible Asset, Useful Life			9 years		10 years	25 years	9 years	13 years	9 years	24 years	9 years	13 years	7 years
Increase in Amortization Expense due to Change in Weighted Average Useful Lives			$ 161,600,000
Amortization Expense All Intangible Assets for Five Succeeding Years:
Amortization Expense FY 2012	349,400,000		349,400,000
Amortization Expense FY 2013	301,600,000		301,600,000
Amortization Expense FY 2014	257,500,000		257,500,000
Amortization Expense FY 2015	217,100,000		217,100,000
Amortization Expense FY 2016	210,400,000		210,400,000
Amortization Expense FY 2017	206,200,000		206,200,000
Impairment charges	$ 0	$ 801,074,000	$ 0	$ 801,074,000