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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - $ / shares | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Class of Stock [Line Items] |  |
Distributions per Common Share (in dollars per share) | $ 0.3915 | $ 0.3675
January 31, 2017 |  |
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 |
February 28, 2017 |  |
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 |
March 31, 2017 |  |
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 |
April 28, 2017 |  |
Class of Stock [Line Items] |  |
Declaration Date | Apr. 11, 2017 |
Record Date | Apr. 21, 2017 |
Payment Date | Apr. 28, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.04350 |
May 31, 2017 |  |
Class of Stock [Line Items] |  |
Declaration Date | Apr. 11, 2017 |
Record Date | May 19, 2017 |
Payment Date | May 31, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.0435 |
June 30, 2017 |  |
Class of Stock [Line Items] |  |
Declaration Date | Apr. 11, 2017 |
Record Date | Jun. 21, 2017 |
Payment Date | Jun. 30, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.0435 |
10/31/2017 |  |
Class of Stock [Line Items] |  |
Declaration Date | Jul. 11, 2017 |
Record Date | Jul. 21, 2017 |
Payment Date | Jul. 31, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.0440 |
11/30/2017 |  |
Class of Stock [Line Items] |  |
Declaration Date | Jul. 11, 2017 |
Record Date | Aug. 21, 2017 |
Payment Date | Aug. 31, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.0440 |
12/29/2017 |  |
Class of Stock [Line Items] |  |
Declaration Date | Jul. 11, 2017 |
Record Date | Sep. 20, 2017 |
Payment Date | Sep. 29, 2017 |
Distributions per Common Share (in dollars per share) | $ 0.0440 |
February 2, 2016 |  |
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
February 29, 2016 |  |
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
March 31, 2016 |  |
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
May 2, 2016 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Apr. 12, 2016
Record Date |  | Apr. 22, 2016
Payment Date |  | May 02, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.04125
May 31, 2016 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Apr. 12, 2016
Record Date |  | May 19, 2016
Payment Date |  | May 31, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.04125
June 30, 2016 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Apr. 12, 2016
Record Date |  | Jun. 17, 2016
Payment Date |  | Jun. 30, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.04125
August 2, 2016 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Jul. 12, 2016
Record Date |  | Jul. 22, 2016
Payment Date |  | Aug. 02, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.04125
August 31, 2016 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Jul. 12, 2016
Record Date |  | Aug. 22, 2016
Payment Date |  | Aug. 31, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.04125
September 30, 2016 |  |
Class of Stock [Line Items] |  |
Declaration Date |  | Jul. 12, 2016
Record Date |  | Sep. 21, 2016
Payment Date |  | Sep. 30, 2016
Distributions per Common Share (in dollars per share) |  | $ 0.04125

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