Quarterly report pursuant to sections 13 or 15(d)

Per Share Data - Additional Information (Detail)

v2.4.0.6
Per Share Data - Additional Information (Detail)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount 55,075,978 33,085,906