• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Stockholders' Equity (Prepaid Share Repurchase Forward Contract) - Additional Information (Detail) - Share Repurchase Plan [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
shares
Subsequent Event [Line Items]  
Number of outstanding prepaid share repurchase forward contract 2
Deutsche Bank AG, London Branch [Member] | 3.875% Convertible Senior Notes [Member]  
Subsequent Event [Line Items]  
Repurchase of common stock under prepaid forward contract | $ $ 29,923
Repurchase of Common stock, shares | shares 622,751
Prepaid stock repurchases forward contract settlement period 2019
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 | shares 191,100
Prepaid stock repurchases forward contract settlement period 2022