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New Financial Accounting Pronouncements - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) Divestiture | Sep. 30, 2018 Obligation | Dec. 31, 2017 | Dec. 31, 2016 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
U.S. federal corporate statutory tax rate |  | 21.00% | 35.00% |
Cash equivalents and restricted cash, original maturities of highly liquid investments |  | 3 months |  |
ASU 2016-15 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Reclassification of certain cash receipts and payments from financing activities to investing activities |  |  |  | $ 1.0
ASU 2014-09 [Member] | Energy Solutions and Industrial Solutions Segments [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Revenue performance obligation, description of timing |  | The typical life of our contracts is generally less than 12 months and each contract generally contains only one performance obligation, to provide goods or services to the customer. |  |
Number of performance obligation | Obligation |  | 1 |  |
ASU 2014-09 [Member] | Maximum [Member] | Energy Solutions and Industrial Solutions Segments [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Contracts life |  | 12 months |  |
ASU 2018-02 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Decrease in Accumulated loss | $ 1.2 |  |  |
Increase in accumulated other comprehensive loss | $ 1.2 |  |  |
ASU 2017-01 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Number of divestitures | Divestiture | 2 |  |  |

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