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Income Taxes - Reconciliation Between Cash Dividends Paid and Dividends Paid Deduction (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Dividends paid	$ 304,973	$ 293,031	$ 264,243
Plus: Deemed dividends on convertible debt	0	0	14,159
Less: Dividends designated to prior year	(5,594)	(5,594)	(5,594)
Plus: Dividends designated from the following year	8,383	5,594	5,594
Less: Return of capital	(226,759)	(145,572)	(146,466)
Dividends paid deduction	$ 81,003	$ 147,459	$ 131,936

X

- Definition

The difference in dividends paid and dividends paid deduction for federal income tax purposes due to deemed dividends on convertible debt.

+ References

No definition available.

+ Details

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X

- Definition

The dividends paid deduction for federal income tax purposes.

+ References

No definition available.

+ Details

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X

- Definition

The difference in dividends paid and dividends paid deduction for federal income tax purposes due to dividends designated from the following year.

+ References

No definition available.

+ Details

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X

- Definition

The difference in dividends paid and dividends paid deduction for federal income tax purposes due to dividends designated to a prior year.

+ References

No definition available.

+ Details

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- Definition

The difference in dividends paid and dividends paid deduction for federal income tax purposes due to return of capital.

+ References

No definition available.

+ Details

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X

- 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

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- References

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