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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Billions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Feb. 29, 2016
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Total backlog | $ 2.5 |  |
Percentage of revenue expected to be recognized over next 12 months | 56.00% |  |
ASU No. 2016-02 |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
New accounting pronouncement or change in accounting principle effect of additional assets and liabilities |  |  | $ 1.2
Receivables Less Allowance for Doubtful Accounts |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue in excess of billings | $ 0.2 | $ 0.3 |
Accounts Payable and Accrued Liabilities |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Billings and cash collections in excess of revenue | $ 0.8 | $ 0.8 |
Minimum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue recognition period | 30 days |  |
Maximum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue recognition period | 60 days |  |

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method. + References No definition available. + Details
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