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Long-Term Debt and Short-Term Borrowings - Schedule of Long-Term Debt and Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Long-Term Debt:    
Senior notes due $ 790,400 $ 789,100
Other 14 63
Total long-term debt 2,574,301 2,710,438
Less current maturities of long-term debt (11) (34,428)
Less unamortized debt issuance costs (26,164) (30,899)
Total long-term debt, net 2,548,126 2,645,111
Warehouse lines of credit 1,254,653 1,750,781
Other 16 16
Total short-term borrowings 1,254,669 1,750,797
Warehouse Agreement Borrowings [Member]    
Long-Term Debt:    
Warehouse lines of credit 1,254,653 1,750,781
5.00% Senior Notes [Member]    
Long-Term Debt:    
Senior notes due 790,400 789,100
5.00% Senior Notes [Member] | Senior Notes [Member]    
Long-Term Debt:    
Senior notes, net of unamortized deferred financing costs 800,000 800,000
4.875% Senior Notes [Member]    
Long-Term Debt:    
Senior notes due 591,200 590,500
4.875% Senior Notes [Member] | Senior Notes [Member]    
Long-Term Debt:    
Senior notes, net of unamortized deferred financing costs 595,912 595,568
5.25% Senior Notes [Member]    
Long-Term Debt:    
Senior notes due 422,200 422,000
5.25% Senior Notes [Member] | Senior Notes [Member]    
Long-Term Debt:    
Senior notes due 426,500 426,682
Interest at daily one- month LIBOR plus 1.60% [Member] | Warehouse Agreement Borrowings [Member]    
Long-Term Debt:    
Warehouse lines of credit 318,555 632,950
Interest at daily one-month LIBOR plus 1.35% with LIBOR floor of 0.35% [Member] | Warehouse Agreement Borrowings [Member]    
Long-Term Debt:    
Warehouse lines of credit 311,160 21,750
Interest at daily one-month LIBOR plus 1.45% [Member] | Warehouse Agreement Borrowings [Member]    
Long-Term Debt:    
Warehouse lines of credit 275,945 241,834
Interest at daily one-month LIBOR plus 1.45% to 1.55% [Member] | Warehouse Agreement Borrowings [Member]    
Long-Term Debt:    
Warehouse lines of credit 191,193 424,789
Interest at daily one-month LIBOR plus 1.35% [Member] | Warehouse Agreement Borrowings [Member]    
Long-Term Debt:    
Warehouse lines of credit 154,032 417,521
Interest at daily one- month LIBOR plus 2.75% [Member] | Warehouse Agreement Borrowings [Member]    
Long-Term Debt:    
Warehouse lines of credit 3,768 11,937
Senior secured term loans [Member]    
Long-Term Debt:    
Senior term loans, with interest ranging from 1.39% to 2.22%, due from 2016 through 2022 $ 751,875 $ 888,125