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Income Tax Expense and Deferred Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Major components of tax expense income [line items]    
Tax effect of total losses not recognized $ 167,030 $ 164,100
Deductible temporary differences for which deferred tax assets have not been recognized 11,253 9,968
Temporary differences associated with investments in subsidiaries 788,137 $ 782,803
Turkey [member]    
Major components of tax expense income [line items]    
Increase in deferred income tax expense due to exchange difference $ 6,530