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Accumulated Other Comprehensive Earnings - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Expense related to pension liability reclassified from accumulated other comprehensive earnings $ 1,200,000 $ 1,400,000
Income (expense) related to fair value of derivative investments reclassified from accumulated other comprehensive earnings 1,800,000 2,400,000
Foreign currency translation reclassified from accumulated other comprehensive earnings $ 0 $ 0