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Notes Payable, Other and Short-term Borrowings - Summary Notes Payable, Other and Short-term Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
May 27, 2016
Dec. 09, 2014
Jun. 26, 2012
Debt Instrument [Line Items]          
Carrying amount of Collateralized borrowings $ 28,360 $ 35,559      
Notes payable and other borrowings 1,289,269 1,650,509      
Short-term borrowings 5,187 6,046      
Carrying amount of Total Notes payable, other and short-term borrowings 1,294,456 1,656,555      
Unsecured Debt [Member] | Senior Revolving Credit Agreement [Member]          
Debt Instrument [Line Items]          
Carrying amount of Long-term debt 70,000        
8.125% Senior Notes [Member]          
Debt Instrument [Line Items]          
Carrying amount of Senior Notes 109,459 109,396      
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 245,257 397,310      
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 [Member]          
Debt Instrument [Line Items]          
Carrying amount of Senior Notes 298,555 298,064      
Carrying amount of Total Notes payable, other and short-term borrowings       $ 295,100  
8.375% Senior Notes [Member]          
Debt Instrument [Line Items]          
Carrying amount of Senior Notes 240,235 242,474      
5.125% Senior Notes [Member]          
Debt Instrument [Line Items]          
Carrying amount of Senior Notes $ 297,403 $ 296,996      
Carrying amount of Total Notes payable, other and short-term borrowings     $ 295,800