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 |
Mar. 31, 2019 |
Mar. 31, 2018 |
|
Loss from impairment of goodwill and intangible assets | $ 6,449 | $ 6,449 | $ 14,816 |
Income tax benefit on goodwill and intangible assets impairment | 1,129 | ||
Commercial Nuclear Utility Business [Member] | |||
Loss from impairment of goodwill and intangible assets | $ 6,449 |