Credit Facilities and Mortgage Notes Payable - Atlanta-Metro Equipment Loan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2013	Apr. 30, 2010 Atlanta-Metro Equipment Loan [Member]	Apr. 09, 2010 Atlanta-Metro Equipment Loan [Member]
Debt Instrument [Line Items]
Loan agreement amount of loan			$ 25.00
Loan agreement interest rate	9.00%		6.85%
Atlanta Metro equipment loan agreement aggregate term of loan		10 years
Loan agreement, maturity date	Dec. 31, 2013	Jun. 01, 2020