Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Accounts payable	$ 1,905	$ 1,726
Accrued network costs	1,122	1,169
Accrued taxes	3,076	3,959
Asset retirement obligations	428	358
Accrued outside services	899	1,049
Accrued accounting and legal	373	212
Accrued recognition awards	195	327
Accrued other	1,009	851
Deferred rent	77	77
Escheat liability	26	5
Lease incentive	189	152
Dividends payable - 2011 Long-Term Incentive Plan (LTIP)	497	0
Total accounts payable and accrued liabilities	$ 9,796	$ 9,885