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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - $ / shares | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Class of Stock [Line Items] |  |
Distributions per Common Share (in dollars per share) | $ 0.129 | $ 0.12
2017-01-31 |  |
Class of Stock [Line Items] |  |
Declaration Date | Jan. 10, 2017 |
Record Date | Jan. 20, 2017 |
Payment Date | Jan. 31, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.043 |
2017-02-28 |  |
Class of Stock [Line Items] |  |
Declaration Date | Jan. 10, 2017 |
Record Date | Feb. 16, 2017 |
Payment Date | Feb. 28, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.043 |
2017-03-31 |  |
Class of Stock [Line Items] |  |
Declaration Date | Jan. 10, 2017 |
Record Date | Mar. 22, 2017 |
Payment Date | Mar. 31, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.043 |
2016-02-02 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Jan. 12, 2016
Record Date |  | Jan. 22, 2016
Payment Date |  | Feb. 02, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.040
2016-02-29 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Jan. 12, 2016
Record Date |  | Feb. 18, 2016
Payment Date |  | Feb. 29, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.040
2016-03-31 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Jan. 12, 2016
Record Date |  | Mar. 21, 2016
Payment Date |  | Mar. 31, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.040

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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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