Earnings Per Share (Narrative) (Detail) (Restricted Stock Units (RSUs) [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Excluded from diluted EPS	0	1,160,753	0	1,160,753
Anti-dilutive securities excluded from earning per share computation	0	0	0	0