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Stockholders' Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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, 2014 | Aug. 29, 2014 | Aug. 05, 2014 | Jun. 30, 2014 | May. 30, 2014 | Apr. 30, 2014 | Mar. 31, 2014 | Feb. 28, 2014 | Jan. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.345 | $ 0.270
Monthly Distribution One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 13, 2015 | Jan. 07, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 23, 2015 | Jan. 22, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 03, 2015 | Jan. 31, 2014
Distributions per Common Share |  |  |  |  |  |  |  |  | $ 0.035 |  |  |  |  |  |  |  |  | $ 0.030 |  |
Monthly Distribution Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 13, 2015 | Jan. 07, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 18, 2015 | Feb. 19, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 27, 2015 | Feb. 28, 2014
Distributions per Common Share |  |  |  |  |  |  |  | $ 0.035 |  |  |  |  |  |  |  |  | $ 0.030 |  |  |
Monthly Distribution Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 13, 2015 | Jan. 07, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 20, 2015 | Mar. 17, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2015 | Mar. 31, 2014
Distributions per Common Share |  |  |  |  |  |  | $ 0.035 |  |  |  |  |  |  |  |  | $ 0.030 |  |  |  |
Monthly Distribution Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 14, 2015 | Apr. 08, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 24, 2015 | Apr. 21, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 04, 2015 | Apr. 30, 2014
Distributions per Common Share |  |  |  |  |  | $ 0.040 |  |  |  |  |  |  |  |  | $ 0.030 |  |  |  |  |
Monthly Distribution Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 14, 2015 | Apr. 08, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 19, 2015 | May 20, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 28, 2015 | May 30, 2014
Distributions per Common Share |  |  |  |  | $ 0.040 |  |  |  |  |  |  |  |  | $ 0.030 |  |  |  |  |  |
Monthly Distribution Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 14, 2015 | Apr. 08, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 19, 2015 | Jun. 19, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2015 | Jun. 30, 2014
Distributions per Common Share |  |  |  | $ 0.040 |  |  |  |  |  |  |  |  | $ 0.030 |  |  |  |  |  |  |
Monthly Distribution Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 14, 2015 | Jul. 15, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 24, 2015 | Jul. 25, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 04, 2015 | Aug. 05, 2014
Distributions per Common Share |  |  | $ 0.040 |  |  |  |  |  |  |  |  | $ 0.030 |  |  |  |  |  |  |  |
Monthly Distribution Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 14, 2015 | Jul. 15, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 20, 2015 | Aug. 20, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 31, 2015 | Aug. 29, 2014
Distributions per Common Share |  | $ 0.040 |  |  |  |  |  |  |  |  | $ 0.030 |  |  |  |  |  |  |  |  |
Monthly Distribution Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 14, 2015 | Jul. 15, 2014
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 21, 2015 | Sep. 19, 2014
Dividend Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2015 | Sep. 30, 2014
Distributions per Common Share | $ 0.040 |  |  |  |  |  |  |  |  | $ 0.030 |  |  |  |  |  |  |  |  |  |

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