Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Share - Additional Information (Detail)

v2.4.0.6
Net Income (Loss) Per Share - Additional Information (Detail)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Cumulative dividends per annum   8.00%
Shares excluded from dilutive shares outstanding because their effect was anti-dilutive 3,180,852 2,683,398