Quarterly Financial Data (Unaudited) - Summary of Company's Unaudited Quarterly Results (Parenthetical) (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Mar. 31, 2019 |
Dec. 31, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
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| Loss from impairment of goodwill and intangible assets | $ 6,449 | $ 0 | $ 14,816 | $ 6,449 | $ 14,816 | |||
| Income tax benefit on goodwill and intangible assets impairment | 1,129 | 2,802 | ||||||
| Restructuring charge | $ 316 | 316 | $ 630 | |||||
| Income tax benefit related to restructuring charge | $ 92 | |||||||
| Income tax benefit | $ (163) | $ 3,010 | $ (2,026) | |||||
| Income tax benefit related to Tax Act | $ 209 | 577 | ||||||
| Commercial Nuclear Utility Business [Member] | ||||||||
| Loss from impairment of goodwill and intangible assets | $ 6,449 | |||||||
| Other charges | 280 | |||||||
| Income tax benefit | $ 87 | |||||||
| X | ||||||||||
- Definition Amount of income tax benefit pertaining to the loss recognized during the period from the impairment of goodwill and the impairment of the carrying amount of tangible and intangible assets, other than goodwill. No definition available.
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| X | ||||||||||
- Definition The charge against earnings resulting from the write down of current assets due to the difference between the carrying value and lower fair value. No definition available.
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| X | ||||||||||
- Definition The amount of income tax benefit related to restructuring charges. No definition available.
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| X | ||||||||||
- Definition Income tax benefit recorded pertaining to the Tax cuts and Jobs Act of 2017. No definition available.
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| X | ||||||||||
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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