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Discontinued Operations - Key Components of Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Discontinued Operations And Disposal Groups [Abstract]        
Site leasing revenue    $ 2,653    $ 2,653
Income from discontinued operations, net of taxes    $ 1,380    $ 1,380