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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.

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