Revenue Recognition and Accounts Receivable - Additional Information (Detail) € in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Jan. 01, 2018 USD ($)
Revenue Recognition And Accounts Receivable [Line Items]
Marketing service fees									$ 57,453,000		$ 60,285,000		$ 54,136,000
Cost of sales	$ 25,626,000	$ 24,020,000	$ 22,835,000	$ 24,147,000	$ 23,562,000	$ 23,717,000	$ 23,177,000	$ 22,581,000	96,628,000		93,037,000		87,853,000
Sale of receivables									11,500,000	€ 9.8	11,200,000	€ 9.8	11,100,000	€ 10.0
Estimated related fee									300,000		300,000		400,000
Other Contract Assets [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Other contract assets impairment									0		0
Other Long-Term Assets [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Other contract assets	$ 1,900,000				$ 1,000,000.0				1,900,000		1,000,000.0
Shipping and Handling Costs [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Cost of sales									2,700,000		$ 3,000,000.0		$ 2,000,000.0
Biologics [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Marketing service fees									$ 57,500,000
Marketing service fee as percentage of segment revenues									96.00%	96.00%
Topic 606 [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net increase to opening retained earnings due to cumulative impact of adoption															$ 4,800,000
Cost of sales									$ 96,628,000