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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - $ / shares |  |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Feb. 29, 2016 | Feb. 02, 2016 | Mar. 31, 2015 | Feb. 27, 2015 | Feb. 03, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Distributions per Common Share |  |  |  |  |  |  | $ 0.120 | $ 0.105
Monthly Distribution One [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  | Jan. 12, 2016 | Jan. 13, 2015
Record Date |  |  |  |  |  |  | Jan. 22, 2016 | Jan. 23, 2015
Dividend Payment Date |  |  |  |  |  |  | Feb. 02, 2016 | Mar. 03, 2015
Distributions per Common Share |  |  | $ 0.040 |  |  | $ 0.035 |  |
Monthly Distribution Two [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  | Jan. 12, 2016 | Jan. 13, 2015
Record Date |  |  |  |  |  |  | Feb. 18, 2016 | Feb. 18, 2015
Dividend Payment Date |  |  |  |  |  |  | Feb. 29, 2016 | Feb. 27, 2015
Distributions per Common Share |  | $ 0.040 |  |  | $ 0.035 |  |  |
Monthly Distribution Three [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  | Jan. 12, 2016 | Jan. 13, 2015
Record Date |  |  |  |  |  |  | Mar. 21, 2016 | Mar. 20, 2015
Dividend Payment Date |  |  |  |  |  |  | Mar. 31, 2016 | Mar. 31, 2015
Distributions per Common Share | $ 0.040 |  |  | $ 0.035 |  |  |  |

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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 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 + Details
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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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- Definition Date the dividend to be paid was declared, 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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