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Revenue (Tables)
 9 Months Ended
Sep. 30, 2020
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)202020192020201920202019
Residential$131,008 $124,169 $690,861 $706,270 $957,379 $961,928 
Small commercial35,204 39,725 159,122 179,519 228,720 250,986 
Large commercial9,942 10,945 32,588 36,030 45,493 49,288 
Industrial/other5,888 3,837 19,089 15,728 25,435 21,826 
Transportation21,040 21,580 65,281 68,297 89,364 90,696 
Revenue from contracts with customers203,082 200,256 966,941 1,005,844 1,346,391 1,374,724 
Alternative revenue program revenues (deferrals)9,199 7,957 9,545 (23,196)7,629 (23,913)
Other revenues (1)(1,447)1,767 (391)6,720 1,646 8,770 
Total Gas operating revenues$210,834 $209,980 $976,095 $989,368 $1,355,666 $1,359,581 
(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 current customer rates that are expected to be returned to customers in future periods.
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)202020192020201920202019
Service Types:
Gas infrastructure services$387,578 $364,241 $935,444 $885,950 $1,288,468 $1,160,017 
Electric power infrastructure services115,386 70,610 282,992 184,277 346,432 202,844 
Other77,428 80,399 190,262 212,185 242,364 335,992 
Total Utility infrastructure services revenues
$580,392 $515,250 $1,408,698 $1,282,412 $1,877,264 $1,698,853 
 Three Months Ended
September 30,		Nine Months Ended
September 30,		Twelve Months Ended September 30,
(Thousands of dollars)202020192020201920202019
Contract Types:
Master services agreement$437,914 $410,283 $1,076,961 $1,021,798 $1,438,540 $1,291,397 
Bid contract142,478 104,967 331,737 260,614 438,724 407,456 
Total Utility infrastructure services revenues
$580,392 $515,250 $1,408,698 $1,282,412 $1,877,264 $1,698,853 
Unit price contracts$377,284 $415,404 $985,673 $1,006,577 $1,359,352 $1,316,404 
Fixed price contracts46,379 37,539 109,935 80,503 142,356 152,890 
Time and materials contracts156,729 62,307 313,090 195,332 375,556 229,559 
Total Utility infrastructure services revenues
$580,392 $515,250 $1,408,698 $1,282,412 $1,877,264 $1,698,853 
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 asset), which are both included within Accounts receivable, net of allowances, as well as amounts billed in excess of revenue earned on contracts (contract liability), which are included in Other current liabilities as of September 30, 2020 and December 31, 2019 on the Company’s Condensed Consolidated Balance Sheets:
(Thousands of dollars)September 30, 2020December 31, 2019
Contracts receivable, net$275,598 $223,904 
Revenue earned on contracts in progress in excess of billings156,754 99,399 
Amounts billed in excess of revenue earned on contracts5,522 4,525 
Schedule of Construction Services Contracts Receivable
Utility infrastructure services contracts receivable consists of the following:
(Thousands of dollars)September 30, 2020December 31, 2019
Billed on completed contracts and contracts in progress$271,872 $216,268 
Other receivables5,214 8,456 
Contracts receivable, gross277,086 224,724 
Allowance for doubtful accounts(1,488)(820)
Contracts receivable, net$275,598 $223,904