Revenue - Additional Information (Detail)	9 Months Ended	12 Months Ended
Sep. 30, 2018 USD ($) segment	Dec. 31, 2017 USD ($)
Capitalized Contract Cost [Line Items]
Capitalized payments	$ 12,000,000
Impairment losses recognized related to contract assets	$ 0	$ 0
Number of operating segments \| segment	2
Production parts average payment terms	30 days
Other Non-current Assets
Capitalized Contract Cost [Line Items]
Capitalized payments	$ 52,000,000	$ 23,000,000

Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
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-Paragraph 3
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Production parts average payment terms.

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