Derivative Financial Instruments - Additional Informations (Detail) (USD $)	1 Months Ended
	Sep. 01, 2013	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Total notional amount	$ 103,000,000	$ 112,942,000	$ 21,077,000
Number of interest cap agreement	3
Total Premium paid	$ 200,000
Minimum
Derivative [Line Items]
Strike price	1.50%
Maximum
Derivative [Line Items]
Strike price	3.50%