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Investments in and Advances to Joint Ventures - Summary of Financial Information for Consolidated Joint Ventures (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 28, 2018 | Sep. 30, 2019 | Sep. 28, 2018 | Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Current assets | $ 1,474,261 |  | $ 1,474,261 |  | $ 1,488,807
Total assets | 3,362,644 |  | 3,362,644 |  | 2,612,578
Current liabilities | 1,156,259 |  | 1,156,259 |  | 1,006,161
Total liabilities | 1,768,193 |  | 1,768,193 |  | 1,657,345
Total joint venture equity | (1,010,654) |  | (1,010,654) |  | (967,537)
Revenues | 1,023,277 | $ 976,157 | 2,917,424 | $ 2,631,568 |
Costs | 798,552 | 783,018 | 2,297,512 | 2,054,201 |
Net income attributable to Parsons Corporation | 56,812 | 41,222 | 106,812 | 214,890 |
Net income attributable to noncontrolling interests | 4,481 | 4,844 | 8,012 | 10,316 |
Consolidated Joint Ventures |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Current assets | 254,204 |  | 254,204 |  | 287,227
Noncurrent assets | 2,836 |  | 2,836 |  | 2,689
Total assets | 257,040 |  | 257,040 |  | 289,916
Current liabilities | 198,079 |  | 198,079 |  | 199,833
Total liabilities | 198,079 |  | 198,079 |  | 199,833
Total joint venture equity | 58,961 |  | 58,961 |  | $ 90,083
Revenues | 117,611 | 126,480 | 341,719 | 413,548 |
Costs | 108,839 | 116,468 | 322,826 | 262,146 |
Net income attributable to Parsons Corporation | 8,772 | 10,012 | 18,893 | 151,402 |
Net income attributable to noncontrolling interests | $ 4,481 | $ 4,844 | $ 8,012 | $ 10,316 |

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