Summary of Significant Accounting Policies - Additional Information 1 (Detail) (USD $)	3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Revolving Credit Loan and Term Loan [Member]	Mar. 31, 2013 Revolving Credit Loan and Term Loan [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
Amortization of the deferred financing costs	582,000			600,000	900,000
Written off unamortization cost relation to assets securitization		1,100,000
Amortization of deferred leasing costs totaled	1,300,000	1,000,000
Deferred income	8,105,000		7,892,000
Amortization of deferred revenue	1,200,000	1,100,000
Notional amount of derivative						150,000,000	150,000,000
Company recorded equity-based compensation expense net of repurchased awards acquired	900,000	400,000
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables	$ 3,100,000		$ 2,900,000