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Debt - Summary of Convertible Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Convertible Notes $ 870,000  
Convertible Notes, net of unamortized discount and deferred offering costs 843,616 $ 830,417 [1]
Total convertible debt, net 843,616 830,417
Total fair value of fixed rate convertible debt $ 875,010 $ 911,348
1.50% Senior Subordinated Convertible Notes Due in October 2020    
Debt Instrument [Line Items]    
Convertible notes stated rate 1.50% 1.50%
Convertible Notes $ 374,993 $ 374,993
Convertible debt, unamortized discount (15,780) (26,581)
Convertible debt, Unamortized deferred offering costs (1,359) (2,334)
Convertible Notes, net of unamortized discount and deferred offering costs 357,854 346,078
Total fair value of fixed rate convertible debt $ 384,713 $ 419,722
0.599% Senior Subordinated Convertible Notes Due in August 2024    
Debt Instrument [Line Items]    
Convertible notes stated rate 0.599% 0.599%
Convertible Notes $ 495,000 $ 495,000
Convertible debt, unamortized discount (6,887) (7,946)
Convertible debt, Unamortized deferred offering costs (2,351) (2,715)
Convertible Notes, net of unamortized discount and deferred offering costs 485,762 484,339
Total fair value of fixed rate convertible debt $ 490,297 $ 491,626
[1]
December 31, 2018 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on February 28, 2019.