Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - Subsequent Event
Jan. 10, 2017
$ / shares
Dividend Period One  
Subsequent Event [Line Items]  
Record Date Jan. 20, 2017
Payment Date Jan. 31, 2017
Dividend Period Two  
Subsequent Event [Line Items]  
Record Date Feb. 16, 2017
Payment Date Feb. 28, 2017
Dividend Period Three  
Subsequent Event [Line Items]  
Record Date Mar. 22, 2017
Payment Date Mar. 31, 2017
Distribution per Common Share  
Subsequent Event [Line Items]  
Distributions (in dollars per share) $ 0.12900
Distribution per Common Share | Dividend Period One  
Subsequent Event [Line Items]  
Distributions (in dollars per share) 0.04300
Distribution per Common Share | Dividend Period Two  
Subsequent Event [Line Items]  
Distributions (in dollars per share) 0.04300
Distribution per Common Share | Dividend Period Three  
Subsequent Event [Line Items]  
Distributions (in dollars per share) 0.04300
Dividends per Preferred Share | Dividends per Series A Term Preferred Share  
Subsequent Event [Line Items]  
Distributions (in dollars per share) 0.3984375
Dividends per Preferred Share | Dividends per Series A Term Preferred Share | Dividend Period One  
Subsequent Event [Line Items]  
Distributions (in dollars per share) 0.1328125
Dividends per Preferred Share | Dividends per Series A Term Preferred Share | Dividend Period Two  
Subsequent Event [Line Items]  
Distributions (in dollars per share) 0.1328125
Dividends per Preferred Share | Dividends per Series A Term Preferred Share | Dividend Period Three  
Subsequent Event [Line Items]  
Distributions (in dollars per share) $ 0.1328125