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Income Taxes - Reconciliation of U. S. Federal Statutory Income Tax Rate to Actual Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Provision computed at statutory rate 21.00% 21.00% 21.00%
U.S. Tax Reform - one-time transition tax 0 0 (0.006)
Remeasurement of deferred taxes (0.60%) 0.20% 0.70%
Change in valuation allowance 0.10% (1.70%) (4.50%)
U.S. impact of Enterprise acquisition 0.30% 1.00% 1.10%
Change in contingent income tax reserves (0.40%) (3.30%) 3.20%
Foreign earnings subject to U.S. taxation 1.50% 1.80% 2.00%
Foreign rate differential (5.50%) (0.70%) (2.00%)
State income tax, net of federal tax benefit 0.40% (0.20%) 0.80%
Tax credits (2.90%) (2.30%) (1.90%)
Equity compensation deductions (3.20%) (4.00%) (2.00%)
Return to provision and other true ups (2.50%) (2.00%) 1.10%
Permanent differences and other 1.80% (0.80%) 0.80%
Provision for income taxes 10.00% 9.00% 19.70%