Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail)

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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - Subsequent Event [Member]
Oct. 13, 2015
$ / shares
Subsequent Event [Line Items]  
Distribution per Common Share $ 0.12
Dividend Period One [Member]  
Subsequent Event [Line Items]  
Record Date Oct. 26, 2015
Payment Date Nov. 04, 2015
Distribution per Common Share $ 0.04
Dividend Period Two [Member]  
Subsequent Event [Line Items]  
Record Date Nov. 17, 2015
Payment Date Nov. 30, 2015
Distribution per Common Share $ 0.04
Dividend Period Three [Member]  
Subsequent Event [Line Items]  
Record Date Dec. 18, 2015
Payment Date Dec. 31, 2015
Distribution per Common Share $ 0.04