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Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Schedule Of Earnings Per Share Basic And Diluted [Line Items]                      
Net Income available to common shareholders (A) $ 43,417 $ 12,583 $ 54,172 $ 30,083 $ 46,591 $ 29,947 $ 41,356 $ 32,856 $ 140,255 $ 150,750 $ 87,411
Weighted average outstanding shares of common stock, basic (B)                 49,392,749 49,550,391 51,165,460
Dilutive effect of options and restricted stock awards                 287,365 183,649 264,107
Weighted average common stock and equivalents (C)                 49,680,114 49,734,040 51,429,567
Earnings per share, basic (A/B) $ 0.88 $ 0.25 $ 1.10 $ 0.61 $ 0.95 $ 0.61 $ 0.84 $ 0.65 $ 2.84 $ 3.04 $ 1.71
Earnings per share, diluted (A/C) $ 0.88 $ 0.25 $ 1.09 $ 0.61 $ 0.95 $ 0.61 $ 0.83 $ 0.65 $ 2.82 $ 3.03 $ 1.70
Antidilutive options and restricted stock shares                 34,486 82,758