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Debt - Senior Unsecured Notes due 2030 - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Feb. 29, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Debt instrument carrying amount $ 1,579,118   $ 1,299,982
2030 Notes      
Debt Instrument [Line Items]      
Debt instrument carrying amount $ 550,000 $ 550,000  
Maturity date of debt instruments Mar. 01, 2030    
Private offered aggregate principal amount rate 5.00% 5.00%  
Debt instrument interest rate terms Payable semi-annually on March 1 and September 1 of each year, commencing on September 1, 2020.    
Purchase price, Percentage of principal amount 101.00%    
2030 Notes | Redemption Period Prior to March 1, 2025      
Debt Instrument [Line Items]      
Purchase price, Percentage of principal amount 100.00%    
2030 Notes | Redemption Period Prior to March 1, 2023      
Debt Instrument [Line Items]      
Purchase price, Percentage of principal amount 105.00%    
2030 Notes | Maximum | Redemption Period Prior to March 1, 2023      
Debt Instrument [Line Items]      
Redemption percentage of aggregate principal amount 40.00%