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Other Income, Net - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Component Of Other Expense Income Nonoperating [Line Items]    
Impairment charge   $ 7.0
Other Assets [Member]    
Component Of Other Expense Income Nonoperating [Line Items]    
Ineffective Prtion Of Cash Flow Hedges $ 3.8