Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accounts payable	$ 48,956	$ 39,767
Accrued compensation	48,653	67,613
Accrued sales discounts, allowances and reserves	140,736	152,911
Accrued other	75,624	73,471
Total accounts payable and accrued expenses	$ 313,969	$ 333,762