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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises - Schedule of Company Lines Available and Borrowings Outstanding (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jan. 29, 2019
Securities Financing Transaction [Line Items]      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises $ 793,194 $ 972,387  
Committed Lines [Member]      
Securities Financing Transaction [Line Items]      
Lines available 1,350,000 1,650,000  
Uncommitted Lines [Member]      
Securities Financing Transaction [Line Items]      
Lines available 525,000 325,000  
Warehouse Facility Due June 17, 2020 [Member]      
Securities Financing Transaction [Line Items]      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises $ 120,945    
Warehouse Facility Due June 17, 2020 [Member] | One Month LIBOR [Member]      
Securities Financing Transaction [Line Items]      
Stated Spread to One Month LIBOR 1.15%    
Warehouse Facility Due June 17, 2020 [Member] | Committed Lines [Member]      
Securities Financing Transaction [Line Items]      
Lines available $ 450,000    
Warehouse Facility Due June 17, 2020 [Member] | One Month LIBOR [Member]      
Securities Financing Transaction [Line Items]      
Stated Spread to One Month LIBOR 1.10%    
Warehouse Facility Due June 17, 2020 [Member] | Uncommitted Lines [Member]      
Securities Financing Transaction [Line Items]      
Lines available $ 200,000    
Warehouse Facility Due September 25, 2019 [Member]      
Securities Financing Transaction [Line Items]      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises $ 189,749 $ 113,452  
Warehouse Facility Due September 25, 2019 [Member] | One Month LIBOR [Member]      
Securities Financing Transaction [Line Items]      
Stated Spread to One Month LIBOR 1.15% 1.20%  
Warehouse Facility Due September 25, 2019 [Member] | Committed Lines [Member]      
Securities Financing Transaction [Line Items]      
Lines available $ 200,000 $ 200,000  
Warehouse Facility Due October 10, 2019 [Member]      
Securities Financing Transaction [Line Items]      
Lines available     $ 1,000,000
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises $ 433,854 [1] $ 416,373 [2]  
Warehouse Facility Due October 10, 2019 [Member] | One Month LIBOR [Member]      
Securities Financing Transaction [Line Items]      
Stated Spread to One Month LIBOR 1.15% [1] 1.20% [2]  
Warehouse Facility Due October 10, 2019 [Member] | Committed Lines [Member]      
Securities Financing Transaction [Line Items]      
Lines available $ 700,000 [1] $ 1,000,000 [2]  
Fannie Mae Repurchase Agreement, Open Maturity [Member]      
Securities Financing Transaction [Line Items]      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises $ 48,646 $ 29,499  
Fannie Mae Repurchase Agreement, Open Maturity [Member] | One Month LIBOR [Member]      
Securities Financing Transaction [Line Items]      
Stated Spread to One Month LIBOR 1.05% 1.15%  
Fannie Mae Repurchase Agreement, Open Maturity [Member] | Uncommitted Lines [Member]      
Securities Financing Transaction [Line Items]      
Lines available $ 325,000 $ 325,000  
Warehouse Facility Due June 19, 2019 [Member]      
Securities Financing Transaction [Line Items]      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   $ 413,063  
Warehouse Facility Due June 19, 2019 [Member] | One Month LIBOR [Member]      
Securities Financing Transaction [Line Items]      
Stated Spread to One Month LIBOR   1.20%  
Warehouse Facility Due June 19, 2019 [Member] | Committed Lines [Member]      
Securities Financing Transaction [Line Items]      
Lines available   $ 450,000  
[1] The warehouse facility was temporarily increased by $400.0 million to $700.0 million for the period of May 16, 2019 to July 15, 2019.
The warehouse facility was temporarily increased by $200.0 million to $500.0 million for the period of July 15, 2019 to August 28, 2019.
The warehouse facility was temporarily increased by an additional $1.3 billion to $1.8 billion for the period no longer than July 16, 2019 to September 13, 2019.
[2] The warehouse facility was temporarily increased by $700.0 million to $1.0 billion for the period of November 30, 2018 to January 29, 2019. On January 29, 2019, the temporary increase was decreased by $400 million to $300 million for the period January 29, 2019 to April 1, 2019.