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Prepaid Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Prepaid expenses [line items]    
Tax advance of VAT and withholdings taxes $ 12,500 $ 12,700
Advance payments of taxes 12,900 14,800
Tax credits 13,200 11,500
Prepaid other 19,896 33,524
GE Engines Services, LLC [member]    
Prepaid expenses [line items]    
Prepaid other $ 4,000 $ 20,000