XML 61 R50.htm IDEA: XBRL DOCUMENT v3.21.2
Exchangeable Senior Notes - Additional Information (Detail) - USD ($)
1 Months Ended
Nov. 02, 2020
Oct. 01, 2020
Sep. 30, 2015
Sep. 30, 2020
Debt Instrument, Redemption, Period One        
Debt Instrument [Line Items]        
Repurchase of exchangeable senior notes   $ 71,513,000    
Repurchase of exchangeable senior notes with common stock (in shares)   124,819    
Repurchase of exchangeable senior notes with common stock   $ 13,495,000    
Debt Instrument, Redemption, Period Two        
Debt Instrument [Line Items]        
Repurchase of exchangeable senior notes $ 503,487,000      
Repurchase of exchangeable senior notes with common stock (in shares) 1,198,962      
Repurchase of exchangeable senior notes with common stock $ 138,900,000      
Principal amount exchanged 503,432,000      
Debt Instrument, Redemption, Period Three        
Debt Instrument [Line Items]        
Repurchase of exchangeable senior notes $ 55,000      
Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes)        
Debt Instrument [Line Items]        
Principal amount of notes issued     $ 575,000,000 $ 575,000,000
Debt stated interest rate     3.125% 3.125%
Related debt issuance costs     $ 11,992,000  
Underwriting fee percentage     2.00%  
Amortization period     5 years  
Effective interest rate on the liability component     4.00%