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Revenue - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Jun. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Revenue recognized   $ 11.8 $ 37.7
Asset, reclassified to receivable   $ 10.3 $ 21.9
Effect of change higher (lower)      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Cumulative Effect on Retained Earnings, Net of Tax $ 4.7