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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Components of Income (Loss) Before Income Taxes
The components of income before income taxes were as follows (in thousands):
 Year Ended December 31,
 202120202019
Income before income taxes:   
Domestic$534,302 $632,791 $550,676 
Foreign88,599 (61,445)21,611 
Total$622,901 $571,346 $572,287 
Provision for Income Taxes
The components of the provision for income taxes were as follows (in thousands):
 Year Ended December 31,
 202120202019
Current:   
Federal$65,273 $134,538 $121,214 
State32,930 45,610 35,329 
Foreign6,644 (745)16,848 
Total current tax provision104,847 179,403 173,391 
Deferred:
Federal27,762 (46,251)7,379 
State(2,418)(3,850)(1,776)
Foreign727 (9,915)(13,522)
Total deferred tax provision (benefit)26,071 (60,016)(7,919)
Total provision for income taxes$130,918 $119,387 $165,472 
Effective Income Tax Rate Reconciliation
The actual income tax provision differed from the income tax provision computed by applying the U.S. federal statutory corporate rate to income before provision for income taxes as follows (in thousands):
Year Ended December 31,
202120202019
Provision at the statutory rate$130,809 $119,983 $120,180 
Increases (decreases) resulting from —
State taxes27,204 31,791 23,399 
Valuation allowance on deferred tax assets 6,107 (31,138)35,761 
Employee per diems, meals and entertainment3,569 10,680 13,817 
Contingency reserves, net844 (2,125)(3,173)
Company-owned life insurance(6,969)— — 
Taxes on joint ventures(8,825)(3,466)(930)
Foreign taxes(9,359)(7,268)(21,565)
Stock-based compensation(21,271)(3,109)(1,863)
Other8,809 4,039 (154)
Total provision for income taxes$130,918 $119,387 $165,472 
Deferred Tax Assets and Liabilities and Net Deferred Income Tax Assets and Liabilities The tax effects of these temporary differences, representing deferred tax assets and liabilities, result principally from the following (in thousands):
December 31,
20212020
Deferred income tax liabilities:
Property and equipment$(278,303)$(236,256)
Goodwill(93,632)(85,467)
Leased assets(76,728)(77,344)
Customer holdbacks(32,661)(30,457)
Other intangible assets— (4,438)
Total deferred income tax liabilities(481,324)(433,962)
Deferred income tax assets:  
Net operating loss carryforwards78,947 82,817 
Lease liabilities76,608 76,826 
Accruals and reserves65,852 70,335 
Stock and incentive compensation50,772 36,590 
Tax credits39,826 42,202 
Other intangible assets19,110 — 
Deferred tax benefits on unrecognized tax positions10,090 10,108 
Other7,535 9,617 
Subtotal348,740 328,495 
Valuation allowance(41,308)(43,255)
Total deferred income tax assets307,432 285,240 
Total net deferred income tax liabilities$(173,892)$(148,722)
The net deferred income tax assets and liabilities comprised the following in the accompanying consolidated balance sheets (in thousands):
 December 31,
 20212020
Deferred income taxes:  
Assets$17,206 $17,685 
Liabilities(191,098)(166,407)
Total net deferred income tax liabilities$(173,892)$(148,722)
Reconciliation of Unrecognized Tax Benefit
A reconciliation of unrecognized tax benefit balances is as follows (in thousands):
 December 31,
 202120202019
Balance at beginning of year$33,219 $40,878 $41,110 
Additions based on tax positions related to the current year6,881 4,398 7,708 
Additions for tax positions of prior years2,339 — 1,200 
Reductions for tax positions of prior years— (2,410)— 
Reductions for audit settlements— (930)(3,205)
Reductions resulting from a lapse of the applicable statute
of limitations periods		(4,702)(8,717)(5,935)
Balance at end of year$37,737 $33,219 $40,878 
Balances of Unrecognized Tax Benefits
The balances of unrecognized tax benefits, the amount of related interest and penalties and what Quanta believes to be the range of reasonably possible changes in the next 12 months are as follows (in thousands):
 December 31,
 202120202019
Unrecognized tax benefits$37,737 $33,219 $40,878 
Portion that, if recognized, would reduce tax expense and
effective tax rate		34,967 30,868 40,695 
Accrued interest on unrecognized tax benefits4,369 5,204 6,240 
Accrued penalties on unrecognized tax benefits1,587 14 14 
Reasonably possible reduction to the balance of unrecognized
tax benefits in succeeding 12 months
$0 to $8,098
$0 to $11,859
$0 to $6,268
Portion that, if recognized, would reduce tax expense and
effective tax rate
$0 to $7,277
$0 to $10,217
$0 to $5,693