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Financing Receivables and Payables - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivables and Payables [Line Items]    
Other current liabilities $ 315,842 $ 331,745
Financing Receivables    
Financing Receivables and Payables [Line Items]    
Other current assets 169,600 192,100
Financing Payables    
Financing Receivables and Payables [Line Items]    
Other current liabilities $ 91,600 $ 124,900