• Filing Date: 2020-03-06
  • Form Type: 10-K
  • Description: Annual report
v3.19.3.a.u2
Stockholders' Equity (Prepaid Share Repurchase Forward Contract) - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Nov. 30, 2018
Mar. 31, 2017
Mar. 03, 2017
4.25% Convertible Senior Notes [Member]        
Class of Stock [Line Items]        
Debt instrument stated interest rate 4.25%   4.25% 4.25%
3.875% Convertible Senior Notes [Member]        
Class of Stock [Line Items]        
Debt instrument stated interest rate 3.875%      
Share Repurchase Plan [Member]        
Class of Stock [Line Items]        
Number of outstanding prepaid share repurchase forward contract 1      
Share Repurchase Plan [Member] | Societe Generale [Member] | 4.25% Convertible Senior Notes [Member]        
Class of Stock [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%  
Share Repurchase Plan [Member] | Deutsche Bank AG, London Branch [Member] | 3.875% Convertible Senior Notes [Member]        
Class of Stock [Line Items]        
Debt instrument stated interest rate   3.875%    
Shares Delivered By Forward Counterparty   622,751