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Revenue Recognition and Related Balance Sheet Accounts (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue Disaggregated by Geographic Location and Contract Type The following tables present Quanta’s revenue disaggregated by contract type and by geographic location, as determined by the job location (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
By contract type:
Fixed price contracts$4,813,711 63.1 %$3,725,174 57.4 %$12,517,491 60.7 %$9,489,949 55.4 %
Unit-price contracts1,692,949 22.2 1,769,369 27.2 4,882,579 23.7 4,830,577 28.2 
Cost-plus contracts1,124,748 14.7 998,624 15.4 3,237,679 15.6 2,798,847 16.4 
Total revenues$7,631,408 100.0 %$6,493,167 100.0 %$20,637,749 100.0 %$17,119,373 100.0 %
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
By primary geographic location:
United States$7,112,960 93.3 %$5,871,453 90.4 %$19,180,023 92.9 %$15,573,776 91.1 %
Canada275,644 3.6 329,066 5.1 724,296 3.5 778,578 4.5 
Australia202,031 2.6 195,815 3.0 571,222 2.8 503,095 2.9 
Others40,773 0.5 96,833 1.5 162,208 0.8 263,924 1.5 
Total revenues$7,631,408 100.0 %$6,493,167 100.0 %$20,637,749 100.0 %$17,119,373 100.0 %
Contract Assets and Liabilities
Contract assets and liabilities consisted of the following (in thousands):
September 30, 2025December 31, 2024
Contract assets$1,563,919 $1,208,619 
Contract liabilities$2,445,429 $2,149,328 
Composition of the Allowance for Credit Losses
Activity in Quanta’s allowance for credit losses consisted of the following (in thousands):
 Three Months EndedNine Months Ended
September 30,September 30,
 2025202420252024
Balance at beginning of period$15,630 $13,955 $15,185 $13,962 
Increase in provision for credit losses897 1,588 2,499 1,859 
Write-offs charged against the allowance net of recoveries of amounts previously written off(563)(1,962)(1,720)(2,240)
Balance at end of period$15,964 $13,581 $15,964 $13,581