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Accumulated Other Comprehensive Earnings - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]    
Expense related to pension liability reclassified from accumulated other comprehensive earnings $ 2,400,000 $ 2,700,000
Income (expense) related to fair value of derivative investments reclassified from accumulated other comprehensive earnings 3,100,000 4,100,000
Foreign currency translation reclassified from accumulated other comprehensive earnings $ 0 $ 0