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Statutory U.S. Federal Income Tax Rate Reconcilation to Effective Income Tax Rates (Detail)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Statutory U.S. federal income tax rate 21.00% 21.00% 35.00% 35.00%
State income taxes, net of related federal income tax benefit   1.80% 1.20% 1.50%
Foreign income taxed at different rates   1.50% (4.60%) (6.50%)
Transition Tax   1.00% 13.70% 0.00%
US net deferred tax liability remeasurement   0.00% (6.00%) 0.00%
Other, net   (1.10%) 0.10% 1.70%
Effective income tax rates   24.20% 39.40% 31.70%