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Income Taxes - Summary of Changes to Gross Unrecognized Tax Benefits (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Income Tax Disclosure [Abstract]
Balance on December 31, 2018	$ 69,779
Addition related to acquisitions	61,483
Addition for tax positions related to current year	10,935
Addition for tax positions related to prior years	1,273
Reduction for tax positions related to prior years	(10,144)
Balance on March 31, 2019	$ 133,326

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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