Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 34,524	$ 28,538
Preferred stock dividends	2,322
Net income available to common stockholders	$ 32,202	$ 28,538
Basic weighted average common shares outstanding	162,186,395	139,650,495
Net effect of dilutive stock options, warrants, restricted stock and convertible debt	1,780,851	1,415,695
Diluted weighted average common shares outstanding	163,967,246	141,066,190
Basic	$ 0.20	$ 0.20
Diluted	$ 0.20	$ 0.20