Summary of Significant Accounting Policies - Additional Information 1 (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Revolving Credit Loan and Term Loan [Member]	Dec. 31, 2012 Revolving Credit Loan and Term Loan [Member]	Dec. 31, 2011 Revolving Credit Loan and Term Loan [Member]	Feb. 08, 2013 Interest Rate Swap [Member]	Feb. 29, 2012 Interest Rate Swap [Member] Cash Flow Hedging [Member]	Feb. 08, 2012 Interest Rate Swap [Member] Cash Flow Hedging [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment losses		$ 0	$ 0	$ 0
Amortization of the deferred financing costs	496,000				2,800,000	3,400,000	3,400,000
Written off of unamortized debt cost			1,400,000		2,200,000
Written off Unamortization cost relation to Assets securitization		1,300,000
Amortization of deferred leasing costs totaled		4,700,000	3,400,000	2,300,000
Deferred income	7,892,000	7,892,000	6,745,000	5,600,000
Amortization of deferred revenue		4,700,000	4,300,000	3,000,000
Notional amount of derivative								150,000,000	150,000,000	150,000,000
Company recorded equity-based compensation expense net of repurchased awards acquired		2,000,000	400,000	800,000
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables	$ 2,900,000	$ 2,900,000	$ 2,400,000