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
Senior Common Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) $ 0.2625
Series A Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.4843749
Series B Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.46875
Series D Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.4374999
Common Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) $ 0.375
Installment 1 - FY2016 [Member]  
Dividends Payable [Line Items]  
Record Date Oct. 21, 2016
Payment Date Oct. 31, 2016
Installment 1 - FY2016 [Member] | Senior Common Stock [Member]  
Dividends Payable [Line Items]  
Payment Date Nov. 07, 2016
Distribution per Share (in dollars per share) $ 0.0875
Installment 1 - FY2016 [Member] | Series A Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.1614583
Installment 1 - FY2016 [Member] | Series B Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.15625
Installment 1 - FY2016 [Member] | Series D Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.1458333
Installment 1 - FY2016 [Member] | Common Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) $ 0.125
Installment 2 - FY2016 [Member]  
Dividends Payable [Line Items]  
Record Date Nov. 17, 2016
Payment Date Nov. 30, 2016
Installment 2 - FY2016 [Member] | Senior Common Stock [Member]  
Dividends Payable [Line Items]  
Payment Date Dec. 07, 2016
Distribution per Share (in dollars per share) $ 0.0875
Installment 2 - FY2016 [Member] | Series A Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.1614583
Installment 2 - FY2016 [Member] | Series B Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.15625
Installment 2 - FY2016 [Member] | Series D Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.1458333
Installment 2 - FY2016 [Member] | Common Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) $ 0.125
Installment 3 - FY2016 [Member]  
Dividends Payable [Line Items]  
Record Date Dec. 20, 2016
Payment Date Dec. 30, 2016
Installment 3 - FY2016 [Member] | Senior Common Stock [Member]  
Dividends Payable [Line Items]  
Payment Date Jan. 09, 2017
Distribution per Share (in dollars per share) $ 0.0875
Installment 3 - FY2016 [Member] | Series A Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.1614583
Installment 3 - FY2016 [Member] | Series B Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.15625
Installment 3 - FY2016 [Member] | Series D Preferred Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) 0.1458333
Installment 3 - FY2016 [Member] | Common Stock [Member]  
Dividends Payable [Line Items]  
Distribution per Share (in dollars per share) $ 0.125