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Commitments and Contingencies - Schedule of Contractual Obligations (Footnotes) (Detail) - USD ($)
2 Months Ended 12 Months Ended
Feb. 01, 2021
Dec. 31, 2020
Jun. 16, 2020
Mar. 16, 2020
Feb. 26, 2020
Dec. 31, 2019
Nov. 06, 2018
Debt Instrument              
Loans held for sale, at fair value   $ 1,086,805,000       $ 215,290,000  
Carrying amount   680,385,000       589,294,000  
Warehouse Facilities              
Debt Instrument              
Loans held for sale, at fair value   1,086,800,000          
Warehouse Facility              
Debt Instrument              
Maximum revolving credit   $ 2,200,000,000          
6.125% Senior Notes | Senior Notes              
Debt Instrument              
Debt instrument face amount             $ 550,000,000.0
Stated interest rate (in percentage)   6.125% 6.125%       6.125%
Carrying amount   $ 542,772,000       540,377,000  
Principal balance   $ 550,000,000       $ 550,000,000  
Revolving Credit Facility | Line of Credit              
Debt Instrument              
Stated interest rate (in percentage)   1.90%       3.76%  
Carrying amount   $ 137,613,000       $ 48,917,000  
Principal balance   $ 140,000,000       $ 50,000,000  
Maximum revolving credit       $ 465,000,000.0 $ 425,000,000.0    
Revolving Credit Facility | Line of Credit | 1 month LIBOR              
Debt Instrument              
Basis spread on variable rate (in percentage)   1.75%          
Committed Lines              
Debt Instrument              
Maximum revolving credit   $ 125,000,000.0          
Committed Lines | 1 month LIBOR              
Debt Instrument              
Basis spread on variable rate (in percentage)   2.00%          
Committed Lines | Warehouse facility due June 17, 2020(1) | Subsequent Event              
Debt Instrument              
Temporary credit increase $ 300,000,000.0            
Committed Lines | Warehouse Facility Due October 9, 2020 | Subsequent Event              
Debt Instrument              
Addition borrowing capacity 900,000,000.0            
Temporary credit increase $ 300,000,000.0            
Interest on warehouse facility | 1 month LIBOR              
Debt Instrument              
Basis spread on variable rate (in percentage)   1.40%