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Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Cash Flows) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]      
Net income $ 237,866 $ 237,952 $ 217,535
Stock-based compensation 11,963 12,836 15,963
Excess tax benefits from stock-based compensation (2,686) (171) (422)
Net cash from operating activities 173,606 299,999 274,369
Net cash from investing activities (385,922) (2,155,468) (2,455,291)
Proceeds from stock option exercises 68,653 10,516 7,438
Excess tax benefits from stock-based compensation 2,686 171 422
Proceeds from issuance of preferred stock 144,486 0 0
Purchase of treasury stock (144,630) (436) (2,029)
Cash dividends paid on preferred stock (6,719) 0 0
Cash dividends paid on common stock (119,619) (116,853) (112,210)
Net cash from financing activities 1,243,462 2,472,856 2,267,537
Net change in cash and cash equivalents 1,031,146 617,387 86,615
Cash and cash equivalents at beginning of year 3,524,979 2,907,592 2,820,977
Cash and cash equivalents at end of year 4,556,125 3,524,979 2,907,592
Parent Company [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net income 237,866 237,952 217,535
Equity in undistributed earnings of subsidiaries (97,756) (99,887) (96,688)
Stock-based compensation 330 330 330
Excess tax benefits from stock-based compensation (155) (133) (213)
Net change in other assets and other liabilities 2,372 (2,256) 2,916
Net cash from operating activities 142,657 136,006 123,880
Net cash from investing activities 0 0 0
Proceeds from stock option exercises 68,653 10,516 7,438
Proceeds from stock-based compensation activities of subsidiaries 11,633 12,506 15,633
Excess tax benefits from stock-based compensation 155 133 213
Proceeds from issuance of preferred stock 144,486 0 0
Purchase of treasury stock (144,630) (436) (2,029)
Cash dividends paid on preferred stock (6,719) 0 0
Cash dividends paid on common stock (119,619) (116,853) (112,210)
Net cash from financing activities (46,041) (94,134) (90,955)
Net change in cash and cash equivalents 96,616 41,872 32,925
Cash and cash equivalents at beginning of year 231,061 189,189 156,264
Cash and cash equivalents at end of year $ 327,677 $ 231,061 $ 189,189