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Debt - Carrying Value of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
May 16, 2008
1.875% Convertible Senior Notes due 2013 [Member]
Dec. 31, 2012
1.875% Convertible Senior Notes due 2013 [Member]
Dec. 31, 2011
1.875% Convertible Senior Notes due 2013 [Member]
Apr. 24, 2009
4.0% Convertible Senior Notes due 2014 [Member]
Dec. 31, 2012
4.0% Convertible Senior Notes due 2014 [Member]
Dec. 31, 2011
4.0% Convertible Senior Notes due 2014 [Member]
Dec. 31, 2012
4.254% Secured Tower Revenue Securities Series 2010-1 [Member]
Dec. 31, 2011
4.254% Secured Tower Revenue Securities Series 2010-1 [Member]
Dec. 31, 2012
5.101% Secured Tower Revenue Securities Series 2010-2 [Member]
Dec. 31, 2011
5.101% Secured Tower Revenue Securities Series 2010-2 [Member]
Dec. 31, 2012
2.933% Secured Tower Revenue Securities Series 2012-1 [Member]
Dec. 31, 2011
2.933% Secured Tower Revenue Securities Series 2012-1 [Member]
Dec. 31, 2012
8.0% Senior Notes due 2016 [Member]
Dec. 31, 2011
8.0% Senior Notes due 2016 [Member]
Dec. 31, 2012
8.25% Senior Notes due 2019 [Member]
Dec. 31, 2011
8.25% Senior Notes due 2019 [Member]
Dec. 31, 2012
5.625% Senior Notes due 2019 [Member]
Dec. 31, 2011
5.625% Senior Notes due 2019 [Member]
Dec. 31, 2012
5.75% Senior Notes due 2020 [Member]
Dec. 31, 2011
5.75% Senior Notes due 2020 [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Dec. 31, 2012
2011 Term Loan B [Member]
Dec. 31, 2011
2011 Term Loan B [Member]
Dec. 31, 2012
2012-1 Term Loan A [Member]
Dec. 31, 2011
2012-1 Term Loan A [Member]
Dec. 31, 2012
2012-2 Term loan B [Member]
Dec. 31, 2011
2012-2 Term loan B [Member]
Debt Instrument [Line Items]                                                            
Debt instrument, principal balance $ 5,440,073 $ 3,512,500   $ 468,836 $ 535,000   $ 499,987 $ 500,000 $ 680,000 $ 680,000 $ 550,000 $ 550,000 $ 610,000       $ 375,000 $ 243,750 $ 375,000 $ 500,000    $ 800,000    $ 100,000   $ 492,500 $ 497,500 $ 195,000    $ 300,000   
Debt 5,356,103 3,354,485   457,351 484,970   430,751 397,612 680,000 680,000 550,000 550,000 610,000       373,198 242,205 372,365 500,000    800,000    100,000    491,518 496,340 195,000    299,278   
Less: current maturities of long-term debt (475,351) (5,000)                                                        
Total long-term debt, net of current maturities $ 4,880,752 $ 3,349,485                                                        
Debt instrument, maturity date     May 01, 2013 May 01, 2013   Oct. 01, 2014 Oct. 01, 2014   Apr. 15, 2015   Apr. 17, 2017   Dec. 15, 2017   Aug. 15, 2016   Aug. 15, 2019   Oct. 01, 2019   Jul. 15, 2020   May 09, 2017   Jun. 30, 2018   May 09, 2017   Sep. 28, 2019