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Accumulated Other Comprehensive Earnings - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]    
Expense related to pension liability reclassified from accumulated other comprehensive earnings $ 2,700,000 $ 2,800,000
Income (expense) related to fair value of derivative investments reclassified from accumulated other comprehensive earnings (4,100,000) (1,900,000)
Foreign currency translation reclassified from accumulated other comprehensive earnings $ 0 $ 0