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Revenue (Tables)

12 Months Ended

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

X

- 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

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+ 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

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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

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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

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