• Filing Date: 2019-03-08
  • Form Type: 10-K
  • Description: Annual report
v3.10.0.1
Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 27, 2019
USD ($)
a
Jan. 15, 2019
USD ($)
$ / shares
shares
Jan. 14, 2019
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Nov. 05, 2018
a
Subsequent Event [Line Items]              
Dividends per common share | $ / shares       $ 1.475 $ 1.40 $ 1.20  
Options to purchase common shares granted | shares       110,000 110,000    
Options exercise price per share | $ / shares       $ 40.00 $ 40.00    
Grant date fair value of restricted stock | $       $ 0 $ 0 $ 0  
Area of land acquired | a             10
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Dividends per common share | $ / shares     $ 0.40        
Date of dividend payable     Mar. 15, 2019        
Record date of dividend payable     Feb. 15, 2019        
Area of land acquired | a 9            
Purchase price of acquired land | $ $ 8,500            
Subsequent Event [Member] | Chief Executive Officer [Member]              
Subsequent Event [Line Items]              
Shares of restricted stock granted | shares   40,000          
Options to purchase common shares granted | shares   110,000          
Options exercise price per share | $ / shares   $ 53          
Options expiration date   Jan. 15, 2029          
Vesting period   4 years          
Grant date fair value of restricted stock | $   $ 1,918          
Grant date fair value of stock options | $   $ 1,345