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
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance     $ 249,744    
Comprehensive income $ (988) $ 289 (1,711) $ 783  
Net income 2,205 2,525 6,878 7,130  
Stockholders' equity, ending balance 259,420   259,420    
Total Equity 264,085 251,216 264,085 251,216 $ 254,419
Senior Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance 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  
Series A and B Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance 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  
Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance 30 28 29 28  
Issuance of Series A and B preferred stock and common stock, net 1 1 2 1  
Stockholders' equity, ending balance 31 29 31 29  
Additional Paid in Capital          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance 573,868 535,399 559,977 534,790  
Issuance of Series A and B preferred stock and common stock, net 19,135 2,877 33,246 3,520  
Retirement of senior common stock, net 0 0 0 (34)  
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership (297) 0 (517) 0  
Stockholders' equity, ending balance 592,706 538,276 592,706 538,276  
Accumulated Other Comprehensive Income          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance (870) 530 (148) 35  
Comprehensive income (989) 288 (1,711) 783  
Stockholders' equity, ending balance (1,859) 818 (1,859) 818  
Distributions in Excess of Accumulated Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance (319,402) (276,927) (310,117) (268,058)  
Distributions declared to common, senior common, and preferred stockholders 14,280 13,508 28,193 26,982  
Net income 2,221 2,525 6,849 7,130  
Stockholders' equity, ending balance (331,461) (287,910) (331,461) (287,910)  
Total Stockholders' Equity          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance 253,629 259,033 249,744 266,798  
Issuance of Series A and B preferred stock and common stock, net 19,136 2,878 33,248 3,521  
Retirement of senior common stock, net 0 0 0 (34)  
Distributions declared to common, senior common, and preferred stockholders 14,280 13,508 28,193 26,982  
Comprehensive income (989) 288 (1,711) 783  
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership (297) 0 (517) 0  
Net income 2,221 2,525 6,849 7,130  
Stockholders' equity, ending balance 259,420 251,216 259,420 251,216  
Non-Controlling Interest          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' equity, beginning balance 4,662 0 4,675 0  
Distributions declared to common, senior common, and preferred stockholders 278 0 556 0  
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership 297 0 517 0  
Net income (16) 0 29 0  
Stockholders' equity, ending balance $ 4,665 $ 0 $ 4,665 $ 0