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Accumulated Other Comprehensive Earnings - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Expense related to pension liability reclassified from accumulated other comprehensive earnings $ 5,000,000 $ 5,300,000 $ 6,200,000
Income (expense) related to fair value of derivative investments reclassified from accumulated other comprehensive earnings 5,200,000 8,200,000 700,000
Foreign currency translation reclassified from accumulated other comprehensive earnings $ 0 $ 0 $ 0