Acquisitions - Schedule of Unaudited Pro Forma Consolidated Results of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 1,096,206	$ 934,723
Operating income	91,974	(955)
Net loss	(281,795)	(328,825)
Site leasing [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	988,216	852,847
Site development [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 107,990	$ 81,876