SHAREHOLDERS' EQUITY - Additional Information (Detail) (USD $)	1 Months Ended		3 Months Ended	9 Months Ended
	Feb. 28, 2011	Jan. 31, 2011	Mar. 31, 2011	Sep. 30, 2011	Sep. 30, 2012	Dec. 31, 2011
Company authorized to issue shares of preferred stock					20,000,000	20,000,000
Preferred stock, par value					$ 0.01	$ 0.01
Preferred stock, Shares Issued
Public stock offering, shares, including underwriter's overallotment			3,450,000
Public stock offering, shares issued		3,000,000
Public stock offering transaction costs			$ 267,000
Proceeds from the issuance of common stock, Value			$ 91,986,000	$ 91,986,000
Underwriter's over-allotment number of shares	450,000