Commitments and Contingencies (Details) (US Cellular Building, US Cellular, Maximum, USD $)	Sep. 30, 2012
US Cellular Building \| US Cellular \| Maximum
Schedule of Commitments Related to Leased Properties [Line Items]
Tenant allowance obligations	$ 374,000

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant