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Revenue (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Summary of Revenue Disaggregated by Service Type and Contract Type
Gas operating revenues on the Condensed Consolidated Statements of Income of both the Company and Southwest include revenue from contracts with customers, which is shown below, disaggregated by customer type, and various categories of revenue:
 Three Months Ended
September 30,		Nine Months Ended
September 30,		Twelve Months Ended September 30,
(Thousands of dollars)202120202021202020212020
Residential$147,326 $131,008 $743,791 $690,861 $1,011,450 $957,379 
Small commercial48,283 35,204 185,774 159,122 248,193 228,720 
Large commercial14,199 9,942 40,030 32,588 52,075 45,493 
Industrial/other9,608 5,888 30,352 19,089 37,505 25,435 
Transportation21,884 21,040 68,217 65,281 91,151 89,364 
Revenue from contracts with customers241,300 203,082 1,068,164 966,941 1,440,374 1,346,391 
Alternative revenue program revenues (deferrals)12,569 9,199 (5,335)9,545 (2,740)7,629 
Other revenues (1)1,979 (1,447)7,747 (391)7,432 1,646 
Total Gas operating revenues$255,848 $210,834 $1,070,576 $976,095 $1,445,066 $1,355,666 
(1) Amounts include late fees and other miscellaneous revenues, and may also include the impact of certain regulatory mechanisms, such as cost-of-service components in customer rates expected to be returned to customers in future periods. Also includes the impacts of a temporary moratorium on late fees and disconnection for nonpayment during the COVID-19 pandemic.
The following tables display Centuri’s revenue, reflected as Utility infrastructure services revenues on the Condensed Consolidated Statements of Income of the Company, representing revenue from contracts with customers disaggregated by service and contract types:
 Three Months Ended
September 30,		Nine Months Ended
September 30,		Twelve Months Ended September 30,
(Thousands of dollars)202120202021202020212020
Service Types:
Gas infrastructure services$393,122 $387,578 $961,836 $935,444 $1,287,552 $1,288,468 
Electric power infrastructure services155,456 115,386 347,061 282,992 475,895 346,432 
Other84,270 77,428 216,551 190,262 301,591 242,364 
Total Utility infrastructure services revenues
$632,848 $580,392 $1,525,448 $1,408,698 $2,065,038 $1,877,264 
 Three Months Ended
September 30,		Nine Months Ended
September 30,		Twelve Months Ended September 30,
(Thousands of dollars)202120202021202020212020
Contract Types:
Master services agreement$467,869 $437,914 $1,160,199 $1,076,961 $1,573,247 $1,438,540 
Bid contract164,979 142,478 365,249 331,737 491,791 438,724 
Total Utility infrastructure services revenues
$632,848 $580,392 $1,525,448 $1,408,698 $2,065,038 $1,877,264 
Unit price contracts$406,404 $377,284 $1,002,779 $985,673 $1,373,746 $1,359,352 
Fixed price contracts64,632 46,379 149,681 109,935 197,447 142,356 
Time and materials contracts161,812 156,729 372,988 313,090 493,845 375,556 
Total Utility infrastructure services revenues
$632,848 $580,392 $1,525,448 $1,408,698 $2,065,038 $1,877,264 
Summary of Information about Receivables, Revenue Earned on Contracts in Progress in Excess of Billings, Which are Included Within Accounts Receivable, Net of Allowances, and Amounts Billed in Excess of Revenue Earned on Contracts
The following table provides information about contracts receivable and revenue earned on contracts in progress in excess of billings (contract assets), which are both included within Accounts receivable, net of allowances; the table also includes amounts billed in excess of revenue earned on contracts (contract liabilities), which are included in Other current liabilities as of September 30, 2021 and December 31, 2020 on the Company’s Condensed Consolidated Balance Sheets:
(Thousands of dollars)September 30, 2021December 31, 2020
Contracts receivable, net$381,387 $278,316 
Revenue earned on contracts in progress in excess of billings207,318 96,996 
Amounts billed in excess of revenue earned on contracts19,954 4,507 
Schedule of Utility Infrastructure Services Contracts Receivable
Utility infrastructure services contracts receivable consists of the following:
(Thousands of dollars)September 30, 2021December 31, 2020
Billed on completed contracts and contracts in progress$380,484 $273,778 
Other receivables2,844 6,692 
Contracts receivable, gross383,328 280,470 
Allowance for doubtful accounts(1,941)(2,154)
Contracts receivable, net$381,387 $278,316