Segment Information and Revenue - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) Customer	Jun. 30, 2017 USD ($) Customer	Jun. 30, 2018 USD ($) Customer	Jun. 30, 2017 USD ($) Customer Employee	Dec. 31, 2017 USD ($)
Entity Wide Revenue Major Customer [Line Items]
Number of customer accounted for 10.9% and 10.7% or $33.3 and $61.7 million of revenue | Customer	1	1	1
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Concentration risk, revenue amount | $	$ 304,085	$ 264,224	$ 578,597	$ 500,527	$ 1,100,000
Number of customer did not account for 10% or greater of outstanding accounts receivable | Customer			1	1
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	10.90%	10.00%	10.70%
Concentration risk, revenue amount | $	$ 33,300	$ 26,600	$ 61,700