Annual report pursuant to Section 13 and 15(d)

Mandatorily Redeemable Term Preferred Stock - Additional Information (Detail)

v3.10.0.1
Mandatorily Redeemable Term Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 29, 2012
Dec. 31, 2018
Class of Stock [Line Items]    
Preferred stock mandatory redemption date Jan. 31, 2017  
Write-off of unamortized offering costs   $ 0.2
Series C Preferred Stock    
Class of Stock [Line Items]    
Redeemable preferred stock, dividend rate percentage (as percent) 7.125%  
Mandatorily Redeemable Preferred Stock    
Class of Stock [Line Items]    
Redeemable preferred stock, shares issued (in shares) 1,540,000  
Redeemable preferred stock, par value (in dollars per share) $ 0.001  
Public offering price (in dollars per share) $ 25.00  
Gross proceeds of the offering $ 38.5  
Net proceeds, after deducting offering expenses $ 36.7