Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - $ / shares
 3 Months Ended
Mar. 31, 2017
Apr. 11, 2017
April 28, 2017    
Subsequent Event [Line Items]    
Record Date Apr. 21, 2017  
Payment Date Apr. 28, 2017  
May 31, 2017    
Subsequent Event [Line Items]    
Record Date May 19, 2017  
Payment Date May 31, 2017  
June 30, 2017    
Subsequent Event [Line Items]    
Record Date Jun. 21, 2017  
Payment Date Jun. 30, 2017  
Preferred Stock | Series A Preferred Stock    
Subsequent Event [Line Items]    
Distributions per share $ 0.3984375  
Subsequent Event | Common Stock    
Subsequent Event [Line Items]    
Distributions per share   $ 0.1305
Subsequent Event | Common Stock | April 28, 2017    
Subsequent Event [Line Items]    
Distributions per share   0.0435
Subsequent Event | Common Stock | May 31, 2017    
Subsequent Event [Line Items]    
Distributions per share   0.0435
Subsequent Event | Common Stock | June 30, 2017    
Subsequent Event [Line Items]    
Distributions per share   0.0435
Subsequent Event | Preferred Stock | Series A Preferred Stock    
Subsequent Event [Line Items]    
Distributions per share   0.3984375
Subsequent Event | Preferred Stock | Series A Preferred Stock | April 28, 2017    
Subsequent Event [Line Items]    
Distributions per share   0.1328125
Subsequent Event | Preferred Stock | Series A Preferred Stock | May 31, 2017    
Subsequent Event [Line Items]    
Distributions per share   0.1328125
Subsequent Event | Preferred Stock | Series A Preferred Stock | June 30, 2017    
Subsequent Event [Line Items]    
Distributions per share   $ 0.1328125