Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Oct. 06, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accretion of interest on deferred consideration	$ 2,343	$ 2,793
Consideration B | BNP Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amount of installment payment			$ 40,000
Consideration A | BNP Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amount of installment payment			$ 8,000