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Debt - Senior Notes and Other Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Mar. 05, 2014
Apr. 16, 2013
Debt Instrument [Line Items]        
Principal $ 1,698,952 $ 1,683,268    
Unamortized Debt Issuance Costs 17,008 19,896    
Carrying Value 1,681,944 1,663,372    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Principal 215,000 115,000    
Unamortized Debt Issuance Costs 3,916 5,053    
Carrying Value 211,084 109,947    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal 1,250,000 1,250,000    
Unamortized Debt Issuance Costs 13,092 14,843    
Carrying Value $ 1,236,908 $ 1,235,157    
5.25% Senior Notes due 2021 [Member]        
Debt Instrument [Line Items]        
Stated interest rate of senior notes (as a percent) 5.25% 5.25%    
5.25% Senior Notes due 2021 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal $ 550,000 $ 550,000    
Unamortized Debt Issuance Costs 5,389 6,287    
Carrying Value $ 544,611 $ 543,713    
Stated interest rate of senior notes (as a percent) 5.25%     5.25%
5.875% Senior Notes due 2023 [Member]        
Debt Instrument [Line Items]        
Stated interest rate of senior notes (as a percent) 5.875% 5.875%    
5.875% Senior Notes due 2023 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal $ 350,000 $ 350,000    
Unamortized Debt Issuance Costs 3,711 4,160    
Carrying Value $ 346,289 $ 345,840    
Stated interest rate of senior notes (as a percent) 5.875%      
5.625% Senior Notes due 2024 [Member]        
Debt Instrument [Line Items]        
Stated interest rate of senior notes (as a percent) 5.625% 5.625%    
5.625% Senior Notes due 2024 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal $ 350,000 $ 350,000    
Unamortized Debt Issuance Costs 3,992 4,396    
Carrying Value $ 346,008 345,604    
Stated interest rate of senior notes (as a percent) 5.625%   5.625%  
Loans Payable and Other Borrowings [Member]        
Debt Instrument [Line Items]        
Principal $ 142,786 134,824    
Unamortized Debt Issuance Costs 0 0    
Carrying Value 142,786 134,824    
Mortgage Warehouse Borrowings [Member]        
Debt Instrument [Line Items]        
Principal 91,166 183,444    
Unamortized Debt Issuance Costs 0 0    
Carrying Value $ 91,166 $ 183,444