Segment Information and Revenue - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) Customer	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Customer	Sep. 30, 2017 USD ($) Customer Employee	Dec. 31, 2017 USD ($)
Entity Wide Revenue Major Customer [Line Items]
Number of customer accounted for 10.2% and 10.5% or $32.7 and $94.4 million of revenue | Customer	1		1
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Concentration risk, revenue amount | $	$ 320,946	$ 285,247	$ 899,543	$ 785,774	$ 1,100,000
Number of customer did not account for 10% or greater of outstanding accounts receivable | Customer			0	0
Number of customer did not account for 10% or greater of revenue | Employee				0
Geographic Concentration Risk
Entity Wide Revenue Major Customer [Line Items]
Percentage of net sales	10.20%	10.30%	10.50%
Concentration risk, revenue amount | $	$ 32,700	$ 29,300	$ 94,400