Quarterly report pursuant to Section 13 or 15(d)

Equity and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail)

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Equity and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance         $ 249,744    
Comprehensive income $ (624) $ 245     (2,335) $ 1,028  
Net income 2,191 2,677     9,068 9,807  
Stockholders' equity, ending balance 253,771       253,771    
Total Equity 258,253 247,124     258,253 247,124 $ 254,419
Senior Common Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance 1 1   $ 1 1 1  
Issuance of Series A and B preferred stock and common stock, net 0   $ 0 0 0    
Stockholders' equity, ending balance 1 1 1 1 1 1  
Series A and B Preferred Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance 2 2   2 2 2  
Issuance of Series A and B preferred stock and common stock, net 0   0 0 0    
Stockholders' equity, ending balance 2 2 2 2 2 2  
Common Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance 31 29   28 29 28  
Issuance of Series A and B preferred stock and common stock, net 0   0 1 2    
Stockholders' equity, ending balance 31 29 29 29 31 29  
Additional Paid in Capital              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance 592,706 538,276   534,790 559,977 534,790  
Issuance of Series A and B preferred stock and common stock, net 7,362   6,619 10,139 40,608    
Retirement of senior common stock, net 0   0 (34) 0    
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership (112)   0 0 (629)    
Stockholders' equity, ending balance 599,956 544,895 538,276 538,276 599,956 544,895  
Accumulated Other Comprehensive Income              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance (1,859) 818   35 (148) 35  
Comprehensive income (624)   245 1,028 (2,335)    
Stockholders' equity, ending balance (2,483) 1,063 818 818 (2,483) 1,063  
Distributions in Excess of Accumulated Earnings              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance (331,461) (287,910)   (268,058) (310,117) (268,058)  
Distributions declared to common, senior common, and preferred stockholders (14,482)   (13,633) (40,615) (42,674)    
Net income 2,207   2,677 9,807 9,055    
Stockholders' equity, ending balance (343,736) (298,866) (287,910) (287,910) (343,736) (298,866)  
Total Stockholders' Equity              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance 259,420 251,216   266,798 249,744 266,798  
Issuance of Series A and B preferred stock and common stock, net 7,362   6,619 10,140 40,610    
Retirement of senior common stock, net 0   0 (34) 0    
Distributions declared to common, senior common, and preferred stockholders (14,482)   (13,633) (40,615) (42,674)    
Comprehensive income (624)   245 1,028 (2,335)    
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership (112)   0 0 (629)    
Net income 2,207   2,677 9,807 9,055    
Stockholders' equity, ending balance 253,771 247,124 251,216 251,216 253,771 247,124  
Non-Controlling Interest              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' equity, beginning balance 4,665 0   0 4,675 0  
Distributions declared to common, senior common, and preferred stockholders (279)   0 0 (835)    
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership 112   0 0 629    
Net income (16)   0 0 13    
Stockholders' equity, ending balance $ 4,482 $ 0 $ 0 $ 0 $ 4,482 $ 0