Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - Subsequent Event [Member]
Oct. 11, 2016
$ / shares
Payment Date October 31 [Member]  
Subsequent Event [Line Items]  
Record Date Oct. 21, 2016
Payment Date Oct. 31, 2016
Payment Date November 30 [Member]  
Subsequent Event [Line Items]  
Record Date Nov. 17, 2016
Payment Date Nov. 30, 2016
Payment Date December 30 [Member]  
Subsequent Event [Line Items]  
Record Date Dec. 20, 2016
Payment Date Dec. 30, 2016
Common Stock [Member]  
Subsequent Event [Line Items]  
Distribution per Common Share $ 0.1275
Common Stock [Member] | Payment Date October 31 [Member]  
Subsequent Event [Line Items]  
Distribution per Common Share 0.0425
Common Stock [Member] | Payment Date November 30 [Member]  
Subsequent Event [Line Items]  
Distribution per Common Share 0.0425
Common Stock [Member] | Payment Date December 30 [Member]  
Subsequent Event [Line Items]  
Distribution per Common Share 0.0425
Preferred Stock [Member]  
Subsequent Event [Line Items]  
Distribution per Common Share 0.3984375
Preferred Stock [Member] | Payment Date October 31 [Member]  
Subsequent Event [Line Items]  
Distribution per Common Share 0.1328125
Preferred Stock [Member] | Payment Date November 30 [Member]  
Subsequent Event [Line Items]  
Distribution per Common Share 0.1328125
Preferred Stock [Member] | Payment Date December 30 [Member]  
Subsequent Event [Line Items]  
Distribution per Common Share $ 0.1328125