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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Carrying Value $ 1,258,832,000 $ 977,175,000  
Warehouse Agreement Borrowings [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Maximum Facility Size 3,400,000,000 3,400,000,000  
Carrying Value $ 1,258,832,000 977,175,000  
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing October 21, 2019 [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Current Maturity Oct. 19, 2020    
Maximum Facility Size $ 985,000,000 985,000,000  
Carrying Value $ 814,604,000 $ 267,075,000  
Line of credit over LIBOR rate 1.30% 1.30%  
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 21, 2019 [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Current Maturity Oct. 19, 2020    
Maximum Facility Size $ 15,000,000 $ 15,000,000  
Carrying Value $ 3,923,000    
Line of credit over LIBOR rate 2.75% 2.75%  
Warehouse Agreement Borrowings [Member] | Capital One [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing July 27, 2020 [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Current Maturity Jul. 27, 2020    
Maximum Facility Size $ 200,000,000 $ 200,000,000  
Carrying Value $ 54,975,000 $ 39,538,000  
Line of credit over LIBOR rate 1.25% 1.25%  
Warehouse Agreement Borrowings [Member] | Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Current Maturity Cancelable anytime    
Maximum Facility Size $ 450,000,000 $ 450,000,000  
Carrying Value $ 31,300,000 $ 360,784,000  
Line of credit over LIBOR rate 1.35% 1.35%  
Line of credit, LIBOR floor rate 0.35% 0.35%  
Warehouse Agreement Borrowings [Member] | TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing June 30, 2020 [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Current Maturity Jun. 30, 2020    
Maximum Facility Size $ 800,000,000 $ 800,000,000  
Carrying Value $ 114,806,000 $ 92,266,000  
Line of credit over LIBOR rate 1.15% 1.15%  
Warehouse Agreement Borrowings [Member] | Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing May 27, 2020 [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Current Maturity May 27, 2020    
Maximum Facility Size $ 350,000,000 $ 350,000,000  
Carrying Value $ 86,779,000 $ 189,465,000  
Line of credit over LIBOR rate 1.20% 1.20%  
Warehouse Agreement Borrowings [Member] | Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing May 27, 2020 [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Current Maturity May 27, 2020    
Maximum Facility Size $ 250,000,000 $ 250,000,000  
Carrying Value   $ 17,457,000  
Line of credit over LIBOR rate 1.15% 1.15%  
Warehouse Agreement Borrowings [Member] | MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 28, 2020 [Member]      
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]      
Current Maturity Jun. 28, 2020    
Maximum Facility Size $ 350,000,000 $ 350,000,000 $ 200,000,000.0
Carrying Value $ 152,445,000 $ 10,590,000  
Line of credit over LIBOR rate 1.20% 1.20%