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Borrowings - Components of Long-Term Debt (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
May 16, 2016
Dec. 31, 2014
May 21, 2014
Line Of Credit Facility [Line Items]          
Long-term debt, Gross $ 1,046,076 $ 1,088,941      
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017 (2,707) (22,999)      
Less: Unamortized debt issuance costs (10,046) (6,742)      
Net carrying amount 1,033,323 1,059,200      
Current portion of borrowings (183,071) (417,350)      
Long-term borrowings $ 850,252 $ 641,850      
Interest rate 3.875% 3.875%   3.875%  
Revolving Credit Facility          
Line Of Credit Facility [Line Items]          
Revolving credit facility, at a rate of 2.27% at December 31, 2016 and 2.17% at December 31, 2015, due 2018 $ 210,000 $ 396,000      
Senior credit facility interest rate 2.27% 2.17%      
Debt maturity date Jul. 16, 2018        
Securitization Program          
Line Of Credit Facility [Line Items]          
Securitization program, at a rate of 1.52% at December 31, 2016 and 1.18% at December 31, 2015 $ 50,000 $ 43,300      
Interest rate 1.52% 1.18%      
3.875% Convertible Senior Subordinated Notes due 2017 | Senior Notes          
Line Of Credit Facility [Line Items]          
3.875% Convertible Senior Subordinated Notes due 2017 $ 136,076 $ 399,641      
Interest rate 3.875% 3.875%      
4.875% Senior Notes due 2026 | Senior Notes          
Line Of Credit Facility [Line Items]          
Senior notes $ 400,000 $ 0 $ 400,000    
Interest rate     4.875%    
5.25% Senior Notes due 2024 | Senior Notes          
Line Of Credit Facility [Line Items]          
Senior notes $ 250,000 $ 250,000     $ 250,000
Interest rate 5.25% 5.25%     5.25%