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) - Jul. 14, 2015 - Subsequent Event [Member] - $ / shares
Total
Subsequent Event [Line Items]  
Distribution per Common Share $ 0.12
Dividend Period One [Member]  
Subsequent Event [Line Items]  
Record Date Jul. 24, 2015
Payment Date Aug. 04, 2015
Distribution per Common Share $ 0.04
Dividend Period Two [Member]  
Subsequent Event [Line Items]  
Record Date Aug. 20, 2015
Payment Date Aug. 31, 2015
Distribution per Common Share $ 0.04
Dividend Period Three [Member]  
Subsequent Event [Line Items]  
Record Date Sep. 21, 2015
Payment Date Sep. 30, 2015
Distribution per Common Share $ 0.04