• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Fair Value Measurements - Components of Long-Term Debt and Methods Used in Estimating Fair Values (Detail)
12 Months Ended
Dec. 31, 2017
Senior Notes [Member]  
Debt Instrument [Line Items]  
Valuation Methodology Closing price listed on the New York Stock Exchange
3.875% Convertible Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt instrument, maturity date 2019
Valuation Methodology Quoted price at January 3, 2018; Discounted cash flow method/Level 3 inputs at December 31, 2016
4.25% Convertible Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt instrument, maturity date 2037
Valuation Methodology Quoted price
3.95% Promissory Note [Member]  
Debt Instrument [Line Items]  
Debt instrument, maturity date 2020
Valuation Methodology Discounted cash flow method/Level 3 inputs
4% Promissory Note [Member]  
Debt Instrument [Line Items]  
Debt instrument, maturity date 2031
Valuation Methodology Discounted cash flow method/Level 3 inputs
3.75% Promissory Note [Member]  
Debt Instrument [Line Items]  
Debt instrument, maturity date 2036
Valuation Methodology Discounted cash flow method/Level 3 inputs