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Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Cash Flows) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 364,149 | $ 304,261 | $ 279,328
Stock-based compensation | 13,013 | 11,799 | 12,737
Net tax benefit from stock-based compensation | 9,062 | 5,063 | 1,434
Net cash from operating activities | 538,079 | 437,842 | 394,860
Net cash received in acquisitions | 0 | (492) | 0
Net cash from investing activities | (670,595) | (1,373,981) | (1,238,920)
Proceeds from issuance of subordinated notes | 98,434 | 0 | 0
Principal payments on subordinated notes | (100,000) | 0 | 0
Proceeds from stock option exercises | 67,746 | 78,866 | 14,853
Purchase of treasury stock | (101,473) | (1,290) | (101,237)
Cash dividends paid on preferred stock | (8,063) | (8,063) | (8,063)
Cash dividends paid on common stock | (144,172) | (134,902) | (132,161)
Net cash from financing activities | 1,044,118 | 1,486,061 | 71,460
Net change in cash and cash equivalents | 911,602 | 549,922 | (772,600)
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 364,149 | 304,261 | 279,328
Equity in undistributed earnings of subsidiaries | (221,440) | (167,326) | (155,755)
Stock-based compensation | 519 | 520 | 480
Net tax benefit from stock-based compensation | 318 | 185 | 161
Net change in other assets and other liabilities | 7,665 | (940) | 2,460
Net cash from operating activities | 151,211 | 136,700 | 126,674
Redemption of investment in Frost Securities, Inc. | 0 | 0 | 216
Net cash from investing activities | 0 | 0 | 216
Proceeds from issuance of subordinated notes | 98,434 | 0 | 0
Principal payments on subordinated notes | (100,000) | 0 | 0
Proceeds from stock option exercises | 67,746 | 78,866 | 14,853
Proceeds from stock-based compensation activities of subsidiaries | 12,494 | 11,279 | 12,257
Purchase of treasury stock | (101,473) | (1,290) | (101,237)
Cash dividends paid on preferred stock | (8,063) | (8,063) | (8,063)
Cash dividends paid on common stock | (144,172) | (134,902) | (132,161)
Net cash from financing activities | (175,034) | (54,110) | (214,351)
Net change in cash and cash equivalents | (23,823) | 82,590 | (87,461)
Cash and cash equivalents at beginning of year | 289,124 | 206,534 | 293,995
Cash and cash equivalents at end of year | $ 265,301 | $ 289,124 | $ 206,534

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