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Detail of Certain Accounts (Tables)
 9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Cash and Cash Equivalents Amounts related to cash and cash equivalents held by consolidated or proportionately consolidated joint ventures and the captive insurance company, which are included in Quanta’s total cash and cash equivalents balances, were as follows (in thousands):
 September 30, 2025December 31, 2024
Cash and cash equivalents held by domestic joint ventures$43,774 $71,646 
Cash and cash equivalents held by foreign joint ventures10,035 10,088 
Total cash and cash equivalents held by joint ventures53,809 81,734 
Cash and cash equivalents held by captive insurance company24,412 19,445 
Cash and cash equivalents not held by joint ventures or captive insurance company532,166 640,781 
Total cash and cash equivalents$610,387 $741,960 
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
 September 30, 2025December 31, 2024
Prepaid expenses$450,269 $268,093 
Other current assets154,918 201,245 
Prepaid expenses and other current assets$605,187 $469,338 
Schedule of Identifiable Intangible Assets
Quanta’s identifiable intangible assets were as follows (in thousands):
September 30, 2025December 31, 2024
Customer relationships$2,990,138 $2,405,606 
Backlog534,486 442,459 
Trade names697,210 569,307 
Non-compete agreements81,092 61,589 
Patented rights, developed technology, process certifications and other35,376 35,317 
Curriculum16,502 15,618 
Other intangible assets subject to amortization
4,354,804 3,529,896 
Accumulated amortization
(2,033,224)(1,672,359)
Other intangible assets subject to amortization, net
2,321,580 1,857,537 
Engineering license3,000 3,000 
Other intangible assets, net
$2,324,580 $1,860,537 
Accounts Payable and Accrued Expenses
Accounts payable and accrued expenses consisted of the following (in thousands):
 September 30, 2025December 31, 2024
Accounts payable, trade$2,783,415 $2,096,125 
Accrued compensation and related expenses845,180 651,893 
Other accrued expenses765,591 974,325 
Accounts payable and accrued expenses$4,394,186 $3,722,343