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 |
|
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 |