Commitments and Contingencies (Details) (USD $)	9 Months Ended	12 Months Ended	26 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012
National Telecommunications Information Administration Broadband Technology Opportunities Program grant [Abstract]
Approximate amount of capital expenditure for advanced high-capacity broadband network pursuant to Broadband Technology Opportunities Program (BTOP) grant	$ 24,000,000
Approximate amount of reimbursement pursuant to Broadband Technology Opportunities Program (BTOP) grant	16,800,000
Capital expenditure incurred	5,521,000	12,664,000	18,185,000
NTIA reimbursements received	$ 2,941,000	$ 6,945,000	$ 9,886,000