Income Taxes - Reconciliation of U. S. Federal Statutory Income Tax Rate to Actual Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Provision computed at statutory rate	21.00%	35.00%	35.00%
U.S. Tax Reform - one-time transition tax	(0.60%)	41.80%	0.00%
Remeasurement of deferred taxes	0.70%	(56.00%)	0.00%
Change in valuation allowance	(4.50%)	96.40%	(1.00%)
US impact of Enterprise acquisition and integration	1.10%	12.90%	(14.10%)
Change in contingent income tax reserves	3.20%	14.00%	(1.60%)
Foreign earnings subject to U.S. taxation	2.00%	2.00%	(6.60%)
Foreign rate differential	(2.00%)	(29.10%)	(16.00%)
Intra-entity transactions	0.00%	(18.80%)	0.00%
State income tax, net of Federal tax benefit	0.80%	(5.30%)	(1.00%)
Tax credits	(1.90%)	(5.70%)	9.50%
Equity compensation deductions	(2.00%)	(5.60%)	(0.40%)
Return to provision and other true ups	1.10%	(3.20%)	(3.70%)
Other	0.80%	2.30%	(6.30%)
Provision for income taxes	19.70%	80.70%	(6.20%)