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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue |
Year ended December 31, |  | 2020 |  | 2019
Revenue by source |  |  |  |
Operations support services |  | $ | 493,407 |  |  | $ | 586,757 |
Construction services |  | 6,967 |  |  | 132,310 |
|  | $ | 500,374 |  |  | $ | 719,067 |
By commercial terms |  |  |  |
Time-and-materials |  | $ | 263,854 |  |  | $ | 343,156 |
Unit-price |  | 225,667 |  |  | 375,911 |
Lump-sum |  | 10,853 |  |  | — |
|  | $ | 500,374 |  |  | $ | 719,067 |
Revenue recognition method |  |  |  |
As-invoiced |  | $ | 341,999 |  |  | $ | 467,013 |
Cost-to-cost percent complete |  | 158,375 |  |  | 252,054 |
|  | $ | 500,374 |  |  | $ | 719,067 |
Contract balances |
|  | December 31, 2020 |  | December 31, 2019
Contract assets |  | $ | 7,034 |  |  | $ | 19,193 |
Contract liabilities |  | 1,512 |  |  | 23 |
The following table provides information about significant changes in the contract assets:
Year ended December 31, |  | 2020 |  | 2019
Balance, beginning of year |  | $ | 19,193 |  |  | $ | 10,673 |
Transferred to receivables from contract assets recognized at the beginning of the period |  | (16,516) |  |  | (10,276) |
Decreases due to derecognition of unpriced contract modifications |  | (2,677) |  |  | — |
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period |  | 6,909 |  |  | 14,892 |
Increases as a result of work completed, but not yet an unconditional right to consideration |  | 125 |  |  | 5,736 |
Decreases due to effect of change in presentation of NL Partnership |  | — |  |  | (1,832) |
Balance, end of year |  | $ | 7,034 |  |  | $ | 19,193 |
The following table provides information about significant changes in the contract liabilities:
Year ended December 31, |  | 2020 |  | 2019
Balance, beginning of year |  | $ | 23 |  |  | $ | 4,032 |
Revenue recognized that was included in the contract liability balance at the beginning of the period |  | (23) |  |  | (4,031) |
Increases due to cash received, excluding amounts recognized as revenue during the period |  | 1,512 |  |  | 174 |
Decreases due to effect of change in presentation of NL Partnership |  | — |  |  | (152) |
Balance, end of year |  | $ | 1,512 |  |  | $ | 23 |
The following table provides information about revenue recognized from performance obligations that were satisfied (or partially satisfied) in previous periods:
Year ended December 31, |  | 2020 |  | 2019
Revenue recognized |  | $ | 1,403 |  |  | $ | 1,857 |
Schedule remaining performance obligations |
For the year ended December 31, |
2021 | $ | 87,289 |
2022 | 11,717 |
2023 | 11,717 |
2024 | 9,270 |
2025 | 6,823 |
| $ | 126,816 |
Summary of contract costs | The following table summarizes contract costs included within other assets on the Consolidated Balance Sheets.
|  | December 31, 2020 |  | December 31, 2019
Fulfillment costs |  | $ | 1,432 |  |  | $ | 1,016 |
Reimbursable bid costs |  | 537 |  |  | — |
|  | $ | 1,969 |  |  | $ | 1,016 |

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- Definition Tabular disclosure of cost capitalized in obtaining or fulfilling contract with customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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