• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Stockholders' Equity (Series B Junior Participating Preferred Share Purchase Right) - Additional Information (Detail) - Share Repurchase Plan [Member] - Series B Junior Participating Preferred Stock [Member]
1 Months Ended 12 Months Ended
Oct. 31, 2013
Right
$ / shares
Dec. 31, 2017
Subsequent Event [Line Items]    
Dividends Payable, Right Per Share | Right 1  
Exercise price per one one-hundredth of each preferred share $ 125.00  
Purchase right of common shareholder   One one-hundredth
Expiry of preferred stock purchase rights   Oct. 18, 2018
Minimum percentage of ownership that triggers exercise rights 10.00%  
Number of days that must lapse after ownership percentage change 10 days  
Preferred stock purchase right exchange or redemption price $ 0.001