Income Taxes Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Taxes [Line Items]
Income tax expense	$ 55,261,000	$ 61,556,000
Effective income tax rate reconciliation, percent	28.30%	31.10%
Base Erosion and Anti-Abuse Tax
Income Taxes [Line Items]
Income tax expense	$ 0	$ 0
Global Intangible Low-Taxed Income
Income Taxes [Line Items]
Income tax expense	$ 0	$ 0