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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]  
Revenue Disaggregated by Geographic Location and Contract Type
The following tables present Quanta’s revenue disaggregated by geographic location, as determined by the job location, and contract type (in thousands):
Three Months Ended September 30, Nine Months Ended September 30,
2021202020212020
By primary geographic location:
United States$2,892,446 86.2 %$2,629,606 87.1 %$7,669,360 84.7 %$7,105,568 85.7 %
Canada382,072 11.4 %320,576 10.6 %1,123,077 12.4 %917,621 11.1 %
Australia52,804 1.6 %49,537 1.6 %170,719 1.9 %156,664 1.9 %
Others25,956 0.8 %20,442 0.7 %93,519 1.0 %110,634 1.3 %
Total revenues$3,353,278 100.0 %$3,020,161 100.0 %$9,056,675 100.0 %$8,290,487 100.0 %

Three Months Ended September 30, Nine Months Ended September 30,
2021202020212020
By contract type:
Unit-price contracts$1,399,358 41.8 %$1,141,102 37.7 %$3,593,644 39.7 %$3,034,169 36.6 %
Cost-plus contracts825,622 24.6 %702,392 23.3 %2,247,879 24.8 %1,958,404 23.6 %
Fixed price contracts1,128,298 33.6 %1,176,667 39.0 %3,215,152 35.5 %3,297,914 39.8 %
Total revenues$3,353,278 100.0 %$3,020,161 100.0 %$9,056,675 100.0 %$8,290,487 100.0 %
Contract Assets and Liabilities
Contract assets and liabilities, recorded as current assets and liabilities, respectively, consisted of the following (in thousands):
September 30, 2021December 31, 2020
Contract assets$760,279 $453,832 
Contract liabilities$501,142 $528,864 
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,
 2021202020212020
Balance at beginning of period$39,713 $14,948 $16,546 $9,398 
Cumulative effect of adoption of new credit loss standard— — — 5,067 
Provision for credit losses249 1,566 24,169 2,910 
Direct write-offs charged against the allowance(253)(110)(1,006)(971)
Balance at end of period$39,709 $16,404 $39,709 $16,404 
Cash and Cash Equivalents
Amounts related to Quanta’s cash and cash equivalents based on geographic location of the bank accounts were as follows (in thousands):
 September 30, 2021December 31, 2020
Cash and cash equivalents held in domestic bank accounts$1,664,990 $156,122 
Cash and cash equivalents held in foreign bank accounts31,220 28,498 
Total cash and cash equivalents$1,696,210 $184,620 
Amounts related to cash and cash equivalents held by 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, 2021December 31, 2020
Cash and cash equivalents held by domestic joint ventures$13,377 $7,714 
Cash and cash equivalents held by foreign joint ventures4,568 3,973 
Total cash and cash equivalents held by joint ventures17,945 11,687 
Cash and cash equivalents held by captive insurance company132,916 85,014 
Cash and cash equivalents not held by joint ventures or captive insurance company1,545,349 87,919 
Total cash and cash equivalents$1,696,210 $184,620 
Accounts Payable and Accrued Expenses
Accounts payable and accrued expenses consisted of the following (in thousands):
 September 30, 2021December 31, 2020
Accounts payable, trade$956,873 $798,023 
Accrued compensation and related expenses497,451 378,002 
Other accrued expenses306,465 333,769 
Accounts payable and accrued expenses$1,760,789 $1,509,794