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Income Taxes - Summary of Tax Characterization of Common Share Dividends Per Share as Reported to Shareholders (Detail) (USD $)	3 Months Ended													12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Date Paid	Jan. 07, 2014	Oct. 08, 2013	Jul. 02, 2013	Apr. 02, 2013	Jan. 04, 2013	Oct. 02, 2012	Jul. 06, 2012	Apr. 03, 2012	Jan. 06, 2012	Oct. 11, 2011	Jul. 06, 2011	Apr. 05, 2011	Jan. 05, 2011
Gross Ordinary Income	$ 0.000000	$ 0.004038	$ 0.004038	$ 0.004038	$ 0.003589	$ 0.000000	$ 0.000000	$ 0.000000	$ 0.000000	$ 0	$ 0	$ 0	$ 0	$ 0.015703	$ 0.000000	$ 0
Capital Gain Distributions	$ 0.000000	$ 0.000000	$ 0.000000	$ 0.000000	$ 0.000000	$ 0.018300	$ 0.018300	$ 0.018300	$ 0.012200	$ 0.000000	$ 0.000000	$ 0.000000	$ 0.000000	$ 0.000000	$ 0.067100	$ 0.000000
Return of Capital	$ 0.000000	$ 0.130962	$ 0.130962	$ 0.130962	$ 0.116411	$ 0.101700	$ 0.101700	$ 0.101700	$ 0.067800	$ 0.060000	$ 0.040000	$ 0.040000	$ 0.020000	$ 0.509297	$ 0.372900	$ 0.160000
Total Dividends	$ 0.000000	$ 0.135000	$ 0.135000	$ 0.135000	$ 0.120000	$ 0.120000	$ 0.120000	$ 0.120000	$ 0.080000	$ 0.060000	$ 0.040000	$ 0.040000	$ 0.020000	$ 0.525000	$ 0.440000	$ 0.160000

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- Definition

Capital Gains Dividends Per Share

+ References

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- Definition

Portion of dividend related to gross ordinary income.

+ References

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- Definition

Portion of dividend related to return of capital.

+ References

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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