Income Taxes - Reconciliation of Provision for Income Taxes (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Provision computed at statutory rate	35.00%	35.00%	35.00%
U.S. Tax Reform - One-time transaction tax	41.80%	0.00%	0.00%
Remeasurement of Deferred Taxes	(56.00%)	0.00%	0.00%
Change in valuation allowance	96.40%	(1.00%)	(8.30%)
US impact of Enterprise acquisition and integration	12.90%	(14.10%)	(26.70%)
Change in contingent income tax reserves	14.00%	(1.60%)	(3.30%)
Foreign earnings subject to U.S. taxation	2.00%	(6.60%)	(3.90%)
Foreign rate differential	(29.10%)	(16.00%)	13.90%
Intra-entity transactions	(18.80%)	0.00%	0.00%
State income tax, net of Federal tax benefit	(5.30%)	(1.00%)	1.10%
Tax credits	(5.70%)	9.50%	6.10%
Equity compensation deductions	(5.60%)	(0.40%)	0.00%
Return to provision and other true ups	(3.20%)	(3.70%)	0.00%
Other	2.30%	(6.30%)	(1.70%)
(Benefit) provision for income taxes	80.70%	(6.20%)	12.20%