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Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue From Contract With Customer [Abstract] |
Summary of Disaggregation of Revenue | The Company’s contracts contain both fixed price and cost reimbursable components. Contract types are based on the component that represents the majority of the contract. The following table presents revenue disaggregated by contract type (in thousands):
|  | December 31, 2018 |  |  | December 31, 2019 |
Cost plus |  | $ | 1,473,815 |  |  | $ | 1,705,832 |
Time-and-Materials |  |  | 961,759 |  |  |  | 1,074,037 |
Fixed price |  |  | 1,124,934 |  |  |  | 1,174,943 |
Total |  | $ | 3,560,508 |  |  | $ | 3,954,812 |
Summary of Contract Assets and Contract Liabilities | Contract assets and contract liabilities balances at December 31, 2018 and December 31, 2019 were as follows (in thousands):
|  | December 31, 2018 |  |  | December 31, 2019 |  |  | $ change |  |  | % change |
Contract assets |  | $ | 515,319 |  |  | $ | 575,089 |  |  | $ | 59,770 |  |  |  | 11.60 | %
Contract liabilities |  |  | 208,576 |  |  |  | 230,681 |  |  |  | 22,105 |  |  |  | 10.60 | %
Net contract assets (liabilities)(1) |  | $ | 306,743 |  |  | $ | 344,408 |  |  | $ | 37,665 |  |  |  | 12.28 | %
(1) | Total contract retentions included in net contract assets (liabilities) were $89.6 million as of December 31, 2018. Total contract retentions included in net contract assets (liabilities) were $85.5 million as of December 31, 2019, of which $41.7 million are not expected to be paid in fiscal 2020. Contract assets at December 31, 2018 and December 31, 2019 include approximately $47.1 million and $73.0 million, respectively, related to unapproved change orders, claims, and requests for equitable adjustment. For the years ended December 31, 2018 and December 31, 2019, no material losses were recognized related to the collectability of claims, unapproved change orders, and requests for equitable adjustment.
Schedule of Change in Contract Assets and Contract Liabilities | The change in contract assets and contract liabilities was the result of normal business activity and not significantly impacted by other factors, except as follows:
|  | December 31, 2018 |  |  | December 31, 2019 |
Acquired contract assets |  | $ | 35,229 |  |  | $ | 9,747 |
Acquired contract liabilities |  |  | 3,529 |  |  |  | 1,300 |
Change in the estimate of variable consideration |  |  | — |  |  |  | 12,166 |
Reversal of provision for contract losses(1) |  | $ | 133,180 |  |  | $ | — |
(1) | Reversal of provision for contract losses of $133.2 million, of which $55.1 million was recorded as an increase in revenue with the remainder recorded as other income.
Summary of Accounts Receivable, Net | Accounts receivable, net consisted of the following as of December 31, 2018 and December 31, 2019 (in thousands):
|  | 2018 |  |  | 2019 |
Billed |  | $ | 538,808 |  |  | $ | 494,366 |
Unbilled |  |  | 135,180 |  |  |  | 218,959 |
Total accounts receivable, gross |  |  | 673,988 |  |  |  | 713,325 |
Allowance for doubtful accounts |  |  | (50,702 | ) |  |  | (41,833 | )
Total accounts receivable, net |  | $ | 623,286 |  |  | $ | 671,492 |
Summary of Remaining Unsatisfied Performance Obligations Expect to Satisfy | The Company expects to satisfy its RUPO as of December 31, 2019 over the following periods (in thousands):
|  | Within One Year |  |  | Within One to Two Years |  |  | Thereafter |
Federal Solutions |  | $ | 1,207,900 |  |  | $ | 451,278 |  |  | $ | 176,103 |
Critical Infrastructure |  |  | 1,634,625 |  |  |  | 632,273 |  |  |  | 859,966 |
Total RUPO |  | $ | 2,842,525 |  |  | $ | 1,083,551 |  |  | $ | 1,036,069 |

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