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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Components of Other Comprehensive Income (Loss) and Related Tax Effects | The components of other comprehensive income (loss) and the related tax effects for the three and nine months ended September 30, 2020 and 2019 were as follows:
| Three Months Ended September 30, 2020 |  | Three Months Ended September 30, 2019
(in thousands) | Before-Tax Amount | Tax (Expense) Benefit | Net-of-Tax Amount |  | Before-Tax Amount | Tax (Expense) Benefit | Net-of-Tax Amount
Other comprehensive income: |  |  |  |  |  |  |
Defined benefit pension plan adjustments | $ | 592 |  | $ | (168) |  | $ | 424 |  |  | $ | 464 |  | $ | (133) |  | $ | 331 |
Foreign currency translation adjustments | 1,333 |  | (231) |  | 1,102 |  |  | (590) |  | 140 |  | (450) |
Unrealized gain (loss) in fair value of investments | (281) |  | 56 |  | (225) |  |  | 328 |  | (72) |  | 256 |
Total other comprehensive income | 1,644 |  | (343) |  | 1,301 |  |  | 202 |  | (65) |  | 137 |
Less: Other comprehensive income (loss) attributable to noncontrolling interests(a) | 520 |  | — |  | 520 |  |  | (99) |  | — |  | (99) |
Total other comprehensive income attributable to Tutor Perini Corporation | $ | 1,124 |  | $ | (343) |  | $ | 781 |  |  | $ | 301 |  | $ | (65) |  | $ | 236 |
(a)The only component of other comprehensive income (loss) attributable to noncontrolling interests is foreign currency translation.
| Nine Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2019
(in thousands) | Before-Tax Amount | Tax (Expense) Benefit | Net-of-Tax Amount |  | Before-Tax Amount | Tax Expense | Net-of-Tax Amount
Other comprehensive income: |  |  |  |  |  |  |
Defined benefit pension plan adjustments | $ | 1,775 |  | $ | (504) |  | $ | 1,271 |  |  | $ | 1,390 |  | $ | (398) |  | $ | 992 |
Foreign currency translation adjustment | (1,621) |  | 365 |  | (1,256) |  |  | 961 |  | (253) |  | 708 |
Unrealized gain in fair value of investments | 2,078 |  | (455) |  | 1,623 |  |  | 2,053 |  | (438) |  | 1,615 |
Total other comprehensive income | 2,232 |  | (594) |  | 1,638 |  |  | 4,404 |  | (1,089) |  | 3,315 |
Less: Other comprehensive income (loss) attributable to noncontrolling interests(a) | (646) |  | — |  | (646) |  |  | 160 |  | — |  | 160 |
Total other comprehensive income attributable to Tutor Perini Corporation | $ | 2,878 |  | $ | (594) |  | $ | 2,284 |  |  | $ | 4,244 |  | $ | (1,089) |  | $ | 3,155 |
(a)The only component of other comprehensive income (loss) attributable to noncontrolling interests is foreign currency translation.
Schedule of Changes in AOCI Balances by Component (After-Tax) | The changes in AOCI balances by component (after tax) attributable to Tutor Perini Corporation during the three and nine months ended September 30, 2020 were as follows:
| Three Months Ended September 30, 2020
(in thousands) | Defined Benefit Pension Plan | Foreign Currency Translation | Unrealized Gain (Loss) in Fair Value of Investments, Net | Accumulated Other Comprehensive Income (Loss)
Attributable to Tutor Perini Corporation: |  |  |  |
Balance as of June 30, 2020 | $ | (36,979) |  | $ | (6,563) |  | $ | 2,945 |  | $ | (40,597) |
Other comprehensive income (loss) before reclassifications | — |  | 582 |  | (3) |  | 579 |
Amounts reclassified from AOCI | 424 |  | — |  | (222) |  | 202 |
Total other comprehensive income | 424 |  | 582 |  | (225) |  | 781 |
Balance as of September 30, 2020 | $ | (36,555) |  | $ | (5,981) |  | $ | 2,720 |  | $ | (39,816) |
| Nine Months Ended September 30, 2020
(in thousands) | Defined Benefit Pension Plan | Foreign Currency Translation | Unrealized Gain (Loss) in Fair Value of Investments, Net | Accumulated Other Comprehensive Income (Loss)
Attributable to Tutor Perini Corporation: |  |  |  |
Balance as of December 31, 2019 | $ | (37,826) |  | $ | (5,371) |  | $ | 1,097 |  | $ | (42,100) |
Other comprehensive income (loss) before reclassifications | — |  | (610) |  | 1,878 |  | 1,268 |
Amounts reclassified from AOCI | 1,271 |  | — |  | (255) |  | 1,016 |
Total other comprehensive income (loss) | 1,271 |  | (610) |  | 1,623 |  | 2,284 |
Balance as of September 30, 2020 | $ | (36,555) |  | $ | (5,981) |  | $ | 2,720 |  | $ | (39,816) |
The changes in AOCI balances by component (after tax) attributable to Tutor Perini Corporation during the three and nine months ended September 30, 2019 were as follows:
| Three Months Ended September 30, 2019
(in thousands) | Defined Benefit Pension Plan | Foreign Currency Translation | Unrealized Gain in Fair Value of Investments, Net | Accumulated Other Comprehensive Income (Loss)
Attributable to Tutor Perini Corporation: |  |  |  |
Balance as of June 30, 2019 | $ | (38,009) |  | $ | (5,416) |  | $ | 895 |  | $ | (42,530) |
Other comprehensive income (loss) before reclassifications | — |  | (351) |  | 254 |  | (97) |
Amounts reclassified from AOCI | 331 |  | — |  | 2 |  | 333 |
Total other comprehensive income (loss) | 331 |  | (351) |  | 256 |  | 236 |
Balance as of September 30, 2019 | $ | (37,678) |  | $ | (5,767) |  | $ | 1,151 |  | $ | (42,294) |
| Nine Months Ended September 30, 2019
(in thousands) | Defined Benefit Pension Plan | Foreign Currency Translation | Unrealized Gain (Loss) in Fair Value of Investments, Net | Accumulated Other Comprehensive Income (Loss)
Attributable to Tutor Perini Corporation: |  |  |  |
Balance as of December 31, 2018 | $ | (38,670) |  | $ | (6,315) |  | $ | (464) |  | $ | (45,449) |
Other comprehensive income before reclassifications | — |  | 548 |  | 1,633 |  | 2,181 |
Amounts reclassified from AOCI | 992 |  | — |  | (18) |  | 974 |
Total other comprehensive income | 992 |  | 548 |  | 1,615 |  | 3,155 |
Balance as of September 30, 2019 | $ | (37,678) |  | $ | (5,767) |  | $ | 1,151 |  | $ | (42,294) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e526-108580 + Details
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