Revenue - Additional Information (Details) contract in Thousands, $ in Billions	3 Months Ended
	Mar. 31, 2019 USD ($) contract	Apr. 01, 2018 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of active contracts | contract	11
Revenue recognized in contract liability balance | $	$ 1.7	$ 1.5
Transferred over Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, percentage from products and services transferred to customers	75.00%	73.00%
Transferred at Point in Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, percentage from products and services transferred to customers	25.00%	27.00%