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Senior Notes and Notes Payable and Other Borrowings - Schedule of Senior Notes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Senior notes $ 868,679 $ 863,816
Discount and deferred loan costs (31,321) (36,184)
4.375% Senior notes due 2019 [Member]    
Debt Instrument [Line Items]    
Senior notes 450,000 450,000
5.875% Senior notes due 2024 [Member]    
Debt Instrument [Line Items]    
Senior notes $ 450,000 $ 450,000