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Condensed Statements of Cash Flow (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Net income (loss) |  | $ 466,201 | $ 495,401 | $ (47,156)
Change in other assets |  | 451,873 | 326,790 | (196,899)
Change in other liabilities |  | 23,329 | (4,336) | 15,425
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |
Treasury stock purchases | [1] | (18,463) | (8,677) | (7,020)
Proceeds from issuance of preferred stock |  | 502,840 |  |
Proceeds from follow-on common stock offering, net |  |  |  | 629,682
Net increase (decrease) in cash and cash equivalents |  | 1,970,319 | 20,176 | (26,476)
Cash and cash equivalents at beginning of year |  | 557,850 | 537,674 | 564,150
Cash and cash equivalents at end of year |  | 2,528,169 | 557,850 | 537,674
Parent Company |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Net income (loss) |  | 466,201 | 495,401 | (47,156)
Change in other assets |  | 10,122 | 316 | (2,253)
Change in other liabilities |  | (36,226) | (2,252) | 22,236
Other, net |  | 36,330 | 33,333 | 32,955
Equity in (underdistributed) overdistributed earnings of subsidiaries |  | (162,316) | (193,760) | 366,175
Net cash provided by operating activities |  | 314,110 | 333,038 | 371,957
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |
Proceeds from sales and repayments of securities |  | 2,000 |  |
Change in receivable from subsidiaries, net |  | 3,089 | (204) | 224
Investment in subsidiaries |  | (420,000) |  | (560,000)
Net cash used in investing activities |  | (414,911) | (204) | (559,776)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |
Treasury stock purchases |  | (18,463) | (8,677) | (7,020)
Cash dividends paid on common and preferred stock |  | (356,768) | (330,810) | (453,981)
Proceeds from issuance of preferred stock |  | 502,840 |  |
Proceeds from follow-on common stock offering, net |  |  |  | 629,682
Net cash provided by (used in) financing activities |  | 127,609 | (339,487) | 168,681
Net increase (decrease) in cash and cash equivalents |  | 26,809 | (6,653) | (19,138)
Cash and cash equivalents at beginning of year |  | 63,727 | 70,380 | 89,518
Cash and cash equivalents at end of year |  | $ 90,536 | $ 63,727 | $ 70,380
[1] | See Note 2, "Summary of Significant Accounting Policies" for a discussion of the Company's adoption of Accounting Standards Update No. 2016-09.

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