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Summary of Significant Accounting Policies - Components of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Retirement benefit assets $ 8,573 $ 6,721
Deferred compensation benefits 30,084 29,222
Inenco equity investment 75,660 0
Investments 42,313 28,793
Cash surrender value of life insurance policies 117,952 106,251
Customer sales returns inventories 56,442 68,160
Guarantees related to borrowings 65,000 42,000
Other long-term prepayments and receivables 172,224 194,383
Total other assets $ 568,248 $ 475,530