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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - Jul. 14, 2015 - Subsequent Event [Member] - $ / shares | Total
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Subsequent Event [Line Items] |
Distribution per Common Share | $ 0.12
Dividend Period One [Member] |
Subsequent Event [Line Items] |
Record Date | Jul. 24, 2015
Payment Date | Aug. 04, 2015
Distribution per Common Share | $ 0.04
Dividend Period Two [Member] |
Subsequent Event [Line Items] |
Record Date | Aug. 20, 2015
Payment Date | Aug. 31, 2015
Distribution per Common Share | $ 0.04
Dividend Period Three [Member] |
Subsequent Event [Line Items] |
Record Date | Sep. 21, 2015
Payment Date | Sep. 30, 2015
Distribution per Common Share | $ 0.04

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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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |