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Income Taxes - Reconciliation Between Cash Dividends Paid and Dividends Paid Deduction (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Dividends paid | $ 264,243 | $ 239,294 | $ 193,101
Plus: Deemed dividends on convertible debt | 14,159 | 12,026 | 9,987
Less: Dividends designated to prior year | (5,594) | (6,608) | (7,030)
Plus: Dividends designated from the following year | 5,594 | 5,594 | 6,608
Less: Return of capital | (146,466) | (172,328) | (169,747)
Dividends paid deduction | $ 131,936 | $ 77,978 | $ 32,919

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- Definition Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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