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Condensed Statements of Cash Flow (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 495,401 $ (47,156) $ 485,397
Change in other assets 326,790 (196,899) 105,575
Change in other liabilities (4,336) 15,425 (16,020)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Treasury stock purchases [1] (8,677) (7,020) (7,283)
Cash dividends paid on common stock (330,810) (453,981) (442,204)
Net cash received from exercise of stock options     60
Proceeds from follow-on common stock offering ,net   629,682  
Net increase (decrease) in cash and cash equivalents 20,176 (26,476) (80,400)
Cash and cash equivalents at beginning of year 537,674 564,150 644,550
Cash and cash equivalents at end of year 557,850 537,674 564,150
Parent Company      
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) 495,401 (47,156) 485,397
Change in other assets 316 (2,253) 293
Change in other liabilities (2,252) 22,236 (2,807)
Other, net 33,333 32,955 30,739
Equity in overdistributed (underdistributed) earnings of subsidiaries (193,760) 366,175 (98,701)
Net cash provided by operating activities 333,038 371,957 414,921
CASH FLOWS FROM INVESTING ACTIVITIES:      
Proceeds from sales and repayments of securities     566
Change in receivable from subsidiaries, net (204) 224 (2,707)
Investment in subsidiaries   (560,000)  
Net cash used in investing activities (204) (559,776) (2,141)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Treasury stock purchases (8,677) (7,020) (7,283)
Cash dividends paid on common stock (330,810) (453,981) (442,204)
Net cash received from exercise of stock options     60
Proceeds from follow-on common stock offering ,net   629,682  
Net cash (used in) provided by financing activities (339,487) 168,681 (449,427)
Net increase (decrease) in cash and cash equivalents (6,653) (19,138) (36,647)
Cash and cash equivalents at beginning of year 70,380 89,518 126,165
Cash and cash equivalents at end of year $ 63,727 $ 70,380 $ 89,518
[1] See Note 2, "Summary of Significant Accounting Policies" for a discussion of the Company's adoption of ASU No. 2016-09.