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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2021202020212020
By primary geographic location:
United States$2,570,798 85.7 %$2,207,876 88.1 %$4,776,914 83.7 %$4,475,962 85.0 %
Canada327,159 10.9 %212,820 8.5 %741,005 13.0 %597,045 11.3 %
Australia62,808 2.1 %56,077 2.2 %117,915 2.1 %107,127 2.0 %
Others39,051 1.3 %29,458 1.2 %67,563 1.2 %90,192 1.7 %
Total revenues$2,999,816 100.0 %$2,506,231 100.0 %$5,703,397 100.0 %$5,270,326 100.0 %

Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
By contract type:
Unit-price contracts$1,217,724 40.6 %$918,416 36.6 %$2,194,286 38.5 %$1,893,067 36.0 %
Cost-plus contracts759,485 25.3 %567,928 22.7 %1,422,257 24.9 %1,256,012 23.8 %
Fixed price contracts1,022,607 34.1 %1,019,887 40.7 %2,086,854 36.6 %2,121,247 40.2 %
Total revenues$2,999,816 100.0 %$2,506,231 100.0 %$5,703,397 100.0 %$5,270,326 100.0 %
Contract Assets and Liabilities
Contract assets and liabilities consisted of the following (in thousands):
June 30, 2021December 31, 2020
Contract assets$669,313 $453,832 
Contract liabilities$503,219 $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 EndedSix Months Ended
June 30,June 30,
 2021202020212020
Balance at beginning of period$16,449 $14,446 $16,546 $9,398 
Cumulative effect of adoption of new credit loss standard— — — 5,067 
Provision for credit losses23,877 1,071 23,920 1,344 
Direct write-offs charged against the allowance(613)(569)(753)(861)
Balance at end of period$39,713 $14,948 $39,713 $14,948 
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):
 June 30, 2021December 31, 2020
Cash and cash equivalents held in domestic bank accounts$176,905 $156,122 
Cash and cash equivalents held in foreign bank accounts35,568 28,498 
Total cash and cash equivalents$212,473 $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):
 June 30, 2021December 31, 2020
Cash and cash equivalents held by domestic joint ventures$13,871 $7,714 
Cash and cash equivalents held by foreign joint ventures4,873 3,973 
Total cash and cash equivalents held by joint ventures18,744 11,687 
Cash and cash equivalents held by captive insurance company132,024 85,014 
Cash and cash equivalents not held by joint ventures or captive insurance company61,705 87,919 
Total cash and cash equivalents$212,473 $184,620 
Accounts Payable and Accrued Expenses
Accounts payable and accrued expenses consisted of the following (in thousands):
 June 30, 2021December 31, 2020
Accounts payable, trade$879,578 $798,023 
Accrued compensation and related expenses400,033 378,002 
Other accrued expenses255,723 333,769 
Accounts payable and accrued expenses$1,535,334 $1,509,794