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Airfone Acquisition - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | |
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Apr. 11, 2013
Customer
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Dec. 31, 2013
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Jan. 31, 2014
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| Business Acquisition [Line Items] | |||
| Purchase price of acquisition | $ 9,344,000 | ||
| Benefit of indemnity provision, including escrow account | 1,000,000 | ||
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Airfone [Member]
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| Business Acquisition [Line Items] | |||
| Number of subscribers for airborne voice communication services | 1,000 | ||
| Purchase price of acquisition | 9,344,000 | ||
| FUSF and related fees remitted to correct past filings covering the period of January 1, 2008 through December 31, 2012 | 1,100,000 | ||
| Aggregate amount of any liability to Airfone customers for the period beginning January 1, 2008 through April 10, 2013 | 2,500,000 | ||
| Due from Airfone related to FUSF and related fees | $ 100,000 |