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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, 2019
Dec. 31, 2018
Feb. 27, 2019
Feb. 04, 2019
Jan. 31, 2019
Jan. 02, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]            
Carrying Value $ 1,561,207,000 $ 1,328,761,000        
Warehouse Agreement Borrowings [Member]            
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]            
Maximum Facility Size 2,975,000,000 2,600,000,000        
Carrying Value $ 1,561,207,000 1,328,761,000        
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. 21, 2019          
Maximum Facility Size $ 985,000,000 985,000,000        
Carrying Value $ 959,921,000 $ 871,680,000        
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. 21, 2019          
Maximum Facility Size $ 15,000,000 $ 15,000,000        
Line of credit over LIBOR rate 2.75% 2.75%        
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   $ 450,000,000   $ 575,000,000
Carrying Value $ 123,237,000 $ 149,089,000        
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 1.20%, maturing June 30, 2019 [Member]            
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]            
Current Maturity Jun. 30, 2019          
Maximum Facility Size $ 400,000,000 $ 400,000,000        
Carrying Value $ 260,740,000 $ 165,945,000        
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 1.30%, maturing June 4, 2019 [Member]            
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]            
Current Maturity Jun. 04, 2019          
Maximum Facility Size $ 225,000,000 $ 225,000,000        
Carrying Value $ 184,079,000 $ 21,852,000        
Line of credit over LIBOR rate 1.30% 1.30%        
Warehouse Agreement Borrowings [Member] | Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing June 4, 2019 [Member]            
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]            
Current Maturity Jun. 04, 2019          
Maximum Facility Size $ 200,000,000 $ 200,000,000        
Line of credit over LIBOR rate 1.15% 1.15%        
Warehouse Agreement Borrowings [Member] | Capital One [Member] | Pricing at daily one-month LIBOR plus 1.35%, maturing July 27, 2019 [Member]            
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]            
Current Maturity Jul. 27, 2019          
Maximum Facility Size $ 700,000,000 $ 325,000,000 $ 200,000,000   $ 200,000,000  
Carrying Value $ 33,230,000 $ 120,195,000        
Line of credit over LIBOR rate 1.35% 1.35%