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Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Cash Flows) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 304,261 | $ 279,328 | $ 277,977
Stock-based compensation | 11,799 | 12,737 | 12,503
Net tax benefit from stock-based compensation | 5,063 | 1,434 | 3,202
Net cash from operating activities | 437,842 | 394,860 | 289,853
Net cash received in acquisitions | (492) | 0 | 830,661
Net cash from investing activities | (1,373,981) | (1,238,920) | (2,282,093)
Proceeds from stock option exercises | 78,866 | 14,853 | 29,158
Purchase of treasury stock | (1,290) | (101,237) | (1,457)
Cash dividends paid on preferred stock | (8,063) | (8,063) | (8,063)
Cash dividends paid on common stock | (134,902) | (132,161) | (127,178)
Net cash from financing activities | 1,486,061 | 71,460 | 1,800,238
Net change in cash and cash equivalents | 549,922 | (772,600) | (192,002)
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 304,261 | 279,328 | 277,977
Equity in undistributed earnings of subsidiaries | (167,326) | (155,755) | (165,569)
Stock-based compensation | 520 | 480 | 441
Net tax benefit from stock-based compensation | 185 | 161 | 165
Net change in other assets and other liabilities | (940) | 2,460 | (2,149)
Net cash from operating activities | 136,700 | 126,674 | 110,865
Redemption of investment in Frost Securities, Inc. | 0 | 216 | 0
Net cash received in acquisitions | 0 | 0 | 830,661
Capital contribution to subsidiaries | 0 | 0 | (879,730)
Net cash from investing activities | 0 | 216 | (49,069)
Proceeds from stock option exercises | 78,866 | 14,853 | 29,158
Proceeds from stock-based compensation activities of subsidiaries | 11,279 | 12,257 | 12,062
Purchase of treasury stock | (1,290) | (101,237) | (1,457)
Cash dividends paid on preferred stock | (8,063) | (8,063) | (8,063)
Cash dividends paid on common stock | (134,902) | (132,161) | (127,178)
Net cash from financing activities | (54,110) | (214,351) | (95,478)
Net change in cash and cash equivalents | 82,590 | (87,461) | (33,682)
Cash and cash equivalents at beginning of year | 206,534 | 293,995 | 327,677
Cash and cash equivalents at end of year | $ 289,124 | $ 206,534 | $ 293,995

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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907 + Details
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