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Notes Payable, Other and Short-Term Borrowings - Summary Notes Payable, Other and Short-term Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Jul. 24, 2018
May 27, 2016
Dec. 09, 2014
Debt Instrument [Line Items]          
Carrying amount of Collateralized borrowings $ 17,318 $ 21,031      
Total Notes payable and other borrowings 1,008,231 763,548      
Short-term borrowings 5,133 5,162      
Carrying amount of Total Notes payable, other and short-term borrowings 1,013,364 768,710      
5.125% Senior Notes Due 2021 [Member]          
Debt Instrument [Line Items]          
Carrying amount of Senior Notes 298,034 297,821      
Carrying amount of Total Notes payable, other and short-term borrowings       $ 295,800  
5.375% Senior Notes Due 2019 [Member]          
Debt Instrument [Line Items]          
Carrying amount of Total Notes payable, other and short-term borrowings         $ 295,100
5.375% Senior Notes Due 2023 [Member]          
Debt Instrument [Line Items]          
Carrying amount of Senior Notes 444,433 $ 444,696      
Carrying amount of Total Notes payable, other and short-term borrowings     $ 444,200    
Unsecured Debt [Member] | Senior Revolving Credit Agreement [Member]          
Debt Instrument [Line Items]          
Carrying amount of Long-term debt $ 248,446