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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]    
Carrying Value $ 1,349,988,000 $ 1,328,761,000
Warehouse Agreement Borrowings [Member]    
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]    
Maximum Facility Size 2,850,000,000 2,600,000,000
Carrying Value $ 1,349,988,000 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 $ 890,625,000 $ 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
Carrying Value $ 186,423,000 $ 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 $ 60,990,000 $ 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 1.20%, 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  
Carrying Value $ 79,745,000  
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 $ 200,000,000
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 1.30%, 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
Carrying Value   $ 21,852,000
Line of credit over LIBOR rate 1.30% 1.30%
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 $ 200,000,000 $ 325,000,000
Carrying Value $ 132,205,000 $ 120,195,000
Line of credit over LIBOR rate 1.35% 1.35%
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 $ 200,000,000  
Line of credit over LIBOR rate 1.20% 1.20%