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Revenue Recognition and Accounts Receivable - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Other Contract Assets [Member] |  |  |
Revenue Recognition And Accounts Receivable [Line Items] |  |  |
Other contract assets impairment | $ 0 | $ 0 |
Other Noncurrent Assets [Member] |  |  |
Revenue Recognition And Accounts Receivable [Line Items] |  |  |
Other contract assets | $ 1,100,000 | $ 1,000,000.0 |
Topic 606 [Member] |  |  |
Revenue Recognition And Accounts Receivable [Line Items] |  |  |
Net increase to opening retained earnings due to cumulative impact of adoption |  |  | $ 4,800,000

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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References 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 + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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