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Notes Payable, Other and Short-term Borrowings - Summary Notes Payable, Other and Short-term Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jul. 24, 2018
Dec. 31, 2017
May 27, 2016
Dec. 09, 2014
Jun. 26, 2012
Debt Instrument [Line Items]            
Carrying amount of Collateralized borrowings $ 24,712   $ 35,559      
Notes payable and other borrowings 1,323,030   1,650,509      
Short-term borrowings 4,995   6,046      
Carrying amount of Total Notes payable, other and short-term borrowings 1,328,025   1,656,555      
Unsecured Debt [Member] | Senior Revolving Credit Agreement [Member]            
Debt Instrument [Line Items]            
Carrying amount of Long-term debt 125,000          
8.125% Senior Notes Due 2042 [Member]            
Debt Instrument [Line Items]            
Carrying amount of Senior Notes     109,396      
Carrying amount of Total Notes payable, other and short-term borrowings           $ 108,700
Converted Term Loan [Member] | Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Carrying amount of Long-term debt 132,456   397,310      
Senior Term Loan Credit Agreement [Member] | Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Carrying amount of Long-term debt     270,710      
5.375% Senior Notes Due 2019 [Member]            
Debt Instrument [Line Items]            
Carrying amount of Senior Notes 298,801   298,064      
Carrying amount of Total Notes payable, other and short-term borrowings         $ 295,100  
8.375% Senior Notes Due July 2018 [Member]            
Debt Instrument [Line Items]            
Carrying amount of Senior Notes     242,474      
5.125% Senior Notes Due 2021 [Member]            
Debt Instrument [Line Items]            
Carrying amount of Senior Notes 297,611   $ 296,996      
Carrying amount of Total Notes payable, other and short-term borrowings       $ 295,800    
5.375% Senior Notes Due 2023 [Member]            
Debt Instrument [Line Items]            
Carrying amount of Senior Notes $ 444,450          
Carrying amount of Total Notes payable, other and short-term borrowings   $ 444,200