Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 62,492	$ 35,161
Weighted average number of shares used in basic earnings per share
Weighted average number of shares used in basic earnings per share	84,570	85,484
Effect of dilutive securities:
Stock options	135	177
Restricted stock units	428	440
Weighted average number of shares used in diluted earnings per share	85,133	86,101
Basic earnings per share attributable to U.S. Cellular shareholders	$ 0.74	$ 0.41
Diluted earnings per share attributable to U.S. Cellular shareholders	$ 0.73	$ 0.41
Common Shares \| Stock Options Member
Effect of dilutive securities:
Antidilutive securities	1,444	1,055
Common Shares \| Restricted Stock Member
Effect of dilutive securities:
Antidilutive securities		1

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