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Condensed Financial Information of Parent Company - Condensed Statements of Earnings (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]                      
Other expense, net                 $ (114,028) $ (138,160) $ (141,025)
Net earnings 25,288 24,239 24,466 21,615 22,136 9,257 23,619 22,268 95,608 77,280 81,733
Parent Company [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Excess in net earnings of subsidiaries                 33,149 (1,261) 20,750
Dividends from the Bank                 63,000 82,300 68,000
Other expense, net                 (541) (3,759) (7,017)
Net earnings                 $ 95,608 $ 77,280 $ 81,733