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Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 519,878 | $ 506,000 | $ 1,566,606 | $ 1,393,685
Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 309,923 | 302,678 | 912,363 | 848,901
Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 132,359 | 143,384 | 461,139 | 368,699
Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 55,239 | 46,904 | 156,573 | 137,366
Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,792 | 19,131 | 58,258 | 50,245
Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 511,125 | 502,226 | 1,553,936 | 1,367,630
Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,188 | 9,871 | 34,397 | 37,581
United States: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 426,978 | 435,328 | 1,341,648 | 1,172,179
United States: | Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 392,827 | 405,010 | 1,217,035 | 1,098,635
United States: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34,151 | 30,318 | 124,613 | 73,544
Canada: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 90,292 | 69,827 | 224,270 | 205,106
Other: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,043 | 6,942 | 22,415 | 27,926
Nuclear Operations Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 386,502 | 394,484 | 1,220,529 | 1,057,637
Nuclear Operations Group | Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 309,621 | 302,181 | 911,175 | 846,823
Nuclear Operations Group | Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 46,864 | 72,820 | 224,394 | 148,860
Nuclear Operations Group | Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 29,714 | 19,483 | 84,537 | 61,622
Nuclear Operations Group | Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 303 | 0 | 423 | 332
Nuclear Operations Group | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 386,443 | 394,407 | 1,220,386 | 1,057,434
Nuclear Operations Group | Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 59 | 77 | 143 | 203
Nuclear Power Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 108,104 | 84,376 | 264,004 | 255,414
Nuclear Power Group | Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 302 | 497 | 1,188 | 2,078
Nuclear Power Group | Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 79,748 | 64,758 | 212,450 | 203,961
Nuclear Power Group | Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 591 | 0 | 599
Nuclear Power Group | Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,054 | 18,530 | 50,366 | 48,776
Nuclear Power Group | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 90,975 | 74,582 | 229,750 | 218,036
Nuclear Power Group | Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,129 | 9,794 | 34,254 | 37,378
Nuclear Services Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,707 | 33,237 | 103,800 | 92,160
Nuclear Services Group | Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Nuclear Services Group | Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,747 | 5,806 | 24,295 | 15,878
Nuclear Services Group | Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 25,525 | 26,830 | 72,036 | 75,145
Nuclear Services Group | Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,435 | 601 | 7,469 | 1,137
Nuclear Services Group | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,707 | 33,237 | 103,800 | 92,160
Nuclear Services Group | Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 528,313 | 512,097 | 1,588,333 | 1,405,211
Operating Segments | Nuclear Operations Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 386,502 | 394,484 | 1,220,529 | 1,057,637
Operating Segments | Nuclear Operations Group | United States: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 384,726 | 392,650 | 1,214,777 | 1,052,951
Operating Segments | Nuclear Operations Group | United States: | Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 362,149 | 376,243 | 1,133,275 | 1,016,594
Operating Segments | Nuclear Operations Group | United States: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22,577 | 16,407 | 81,502 | 36,357
Operating Segments | Nuclear Operations Group | Canada: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Nuclear Operations Group | Other: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,776 | 1,834 | 5,752 | 4,686
Operating Segments | Nuclear Power Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 108,104 | 84,376 | 264,004 | 255,414
Operating Segments | Nuclear Power Group | United States: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,479 | 10,130 | 26,076 | 28,265
Operating Segments | Nuclear Power Group | United States: | Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Nuclear Power Group | United States: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,479 | 10,130 | 26,076 | 28,265
Operating Segments | Nuclear Power Group | Canada: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 89,358 | 69,138 | 221,265 | 203,909
Operating Segments | Nuclear Power Group | Other: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,267 | 5,108 | 16,663 | 23,240
Operating Segments | Nuclear Services Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,707 | 33,237 | 103,800 | 92,160
Operating Segments | Nuclear Services Group | United States: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,773 | 32,548 | 100,795 | 90,963
Operating Segments | Nuclear Services Group | United States: | Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,678 | 28,767 | 83,760 | 82,041
Operating Segments | Nuclear Services Group | United States: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,095 | 3,781 | 17,035 | 8,922
Operating Segments | Nuclear Services Group | Canada: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 934 | 689 | 3,005 | 1,197
Operating Segments | Nuclear Services Group | Other: | Non-Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (8,435) | (6,097) | (21,727) | (11,526)
Eliminations | Nuclear Operations Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ (970) | $ (1,260) | $ (2,506) | $ (3,164)

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