Organization and Principles of Consolidation (Details Textual)	Mar. 31, 2013 States
Product Information [Line Items]
Number of operating states	17
Communication Services [Member]
Product Information [Line Items]
Number of Access Line Equivalents	1,300,000
Number of Data Subscribers	330,000,000
Communication Services [Member] | Minimum [Member]
Product Information [Line Items]
Number of route miles in fiber network	15,000