Lease Agreements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013 integer
Schedule of Operating Leases [Line Items]
Operating Lease terms	The leases entered into between the customer and us for the rental of a Site are generally month-to-month or for a period of one to ten years, renewable upon the consent of the parties or, in some instances, as provided by statute.
Number of properties where non-cancelable long-term leases are in effect	17
Minimum
Schedule of Operating Leases [Line Items]
Operating Lease, expiration period year	1 year
Maximum
Schedule of Operating Leases [Line Items]
Operating Lease, expiration period year	10 years