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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Aug. 31, 2016 | Aug. 02, 2016 | Jun. 30, 2016 | May 31, 2016 | May 02, 2016 | Mar. 31, 2016 | Feb. 29, 2016 | Feb. 02, 2016 | Sep. 30, 2015 | Aug. 31, 2015 | Aug. 04, 2015 | Jun. 30, 2015 | May 28, 2015 | May 04, 2015 | Mar. 31, 2015 | Feb. 27, 2015 | Feb. 03, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.3675 | $ 0.345
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 | Feb. 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 |  |  |  |
Monthly Distribution Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 12, 2016 | Apr. 14, 2015
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 22, 2016 | Apr. 24, 2015
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 02, 2016 | May 04, 2015
Distributions per Common Share |  |  |  |  |  | $ 0.04125 |  |  |  |  |  |  |  |  | $ 0.040 |  |  |  |  |
Monthly Distributions Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 12, 2016 | Apr. 14, 2015
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 19, 2016 | May 19, 2015
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 31, 2016 | May 28, 2015
Distributions per Common Share |  |  |  |  | $ 0.04125 |  |  |  |  |  |  |  |  | $ 0.040 |  |  |  |  |  |
Monthly Distributions Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 12, 2016 | Apr. 14, 2015
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 17, 2016 | Jun. 19, 2015
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2016 | Jun. 30, 2015
Distributions per Common Share |  |  |  | $ 0.04125 |  |  |  |  |  |  |  |  | $ 0.040 |  |  |  |  |  |  |
Monthly Distribution Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 12, 2016 | Jul. 14, 2015
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 22, 2016 | Jul. 24, 2015
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 02, 2016 | Aug. 04, 2015
Distributions per Common Share |  |  | $ 0.04125 |  |  |  |  |  |  |  |  | $ 0.040 |  |  |  |  |  |  |  |
Monthly Distribution Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 12, 2016 | Jul. 14, 2015
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 22, 2016 | Aug. 20, 2015
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 31, 2016 | Aug. 31, 2015
Distributions per Common Share |  | $ 0.04125 |  |  |  |  |  |  |  |  | $ 0.040 |  |  |  |  |  |  |  |  |
Monthly Distribution Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 12, 2016 | Jul. 14, 2015
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 21, 2016 | Sep. 21, 2015
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2016 | Sep. 30, 2015
Distributions per Common Share | $ 0.04125 |  |  |  |  |  |  |  |  | $ 0.040 |  |  |  |  |  |  |  |  |  |

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