Quarterly report pursuant to Section 13 or 15(d)

Mandatorily-Redeemable Preferred Stock (Detail)

v3.8.0.1
Mandatorily-Redeemable Preferred Stock (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 27, 2018
Aug. 17, 2016
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]          
Preferred stock par value (in dollars per share)     $ 0.001   $ 0
Common stock, shares issued (in shares)         13,791,574
Proceeds from issuance of equity     $ 17,486 $ 20,722  
Offering costs $ 12,700   $ 685 $ 1,054  
Series A Preferred Stock          
Subsidiary, Sale of Stock [Line Items]          
Dividend rate (as percent)   6.375%      
Preferred stock par value (in dollars per share)   $ 0.001      
Average sales price price (in dollars per share)   $ 25      
Proceeds from issuance of equity   $ 27,600      
Redemption price (in dollars per share)   $ 25 $ 25.74    
Offering costs   $ 1,200      
Fair value of preferred stock     $ 29,600    
Series A Preferred Stock | Preferred Stock          
Subsidiary, Sale of Stock [Line Items]          
Common stock, shares issued (in shares)   1,150,000      
Proceeds from issuance of preferred stock   $ 28,800      
Distributions per share (in dollars per share)     $ 0.3984375 $ 0.3984375  
Series A Preferred Stock | 4/30/2018 | Preferred Stock          
Subsidiary, Sale of Stock [Line Items]          
Distributions per share (in dollars per share)     0.1328125 0.1328125  
Series A Preferred Stock | 5/31/2018 | Preferred Stock          
Subsidiary, Sale of Stock [Line Items]          
Distributions per share (in dollars per share)     0.1328125 0.1328125  
Series A Preferred Stock | 6/29/2018 | Preferred Stock          
Subsidiary, Sale of Stock [Line Items]          
Distributions per share (in dollars per share)     $ 0.1328125 $ 0.1328125