• Filing Date: 2019-03-08
  • Form Type: 10-K
  • Description: Annual report
v3.10.0.1
Stockholders' Equity (Prepaid Share Repurchase Forward Contract) - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Nov. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Mar. 03, 2017
3.875% Convertible Senior Notes [Member]          
Subsequent Event [Line Items]          
Debt instrument stated interest rate 3.875%   3.875%    
4.25% Convertible Senior Notes [Member]          
Subsequent Event [Line Items]          
Debt instrument stated interest rate 4.25%       4.25%
Share Repurchase Plan [Member]          
Subsequent Event [Line Items]          
Number of outstanding prepaid share repurchase forward contract 1        
Share Repurchase Plan [Member] | Deutsche Bank AG, London Branch [Member] | 3.875% Convertible Senior Notes [Member]          
Subsequent Event [Line Items]          
Debt instrument stated interest rate   3.875%      
Shares Delivered By Forward Counterparty   622,751      
Share Repurchase Plan [Member] | Societe Generale [Member] | 4.25% Convertible Senior Notes [Member]          
Subsequent Event [Line Items]          
Repurchase of common stock under prepaid forward contract $ 9,400        
Repurchase of Common stock, shares 191,000        
Prepaid stock repurchases forward contract settlement period 2022        
Debt instrument stated interest rate       4.25%