Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income	$ 268,631	$ 227,301
Changes in other comprehensive income (loss):
Unrealized holding gains (losses) on marketable securities, net	596	(460)
Unrealized losses on foreign currency forward contracts, net of tax of $1.5 million and $0.3 million, respectively		(862)
Unrealized losses on foreign currency forward contracts, net of tax of $1.5 million and $0.3 million, respectively	(222)
Foreign currency translation adjustment	4,967	(2,729)
Total changes in other comprehensive income (loss)	5,341	(4,051)
Comprehensive income	273,972	223,250
Comprehensive income attributable to noncontrolling interest	0	(17,038)
Comprehensive income attributable to Vertex	$ 273,972	$ 206,212

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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