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Electric utility segment - Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net income for common stock | $ 49,573 | $ 65,900 | $ 46,054 | $ 40,247 | $ 32,370 | $ 60,073 | $ 38,661 | $ 34,193 | $ 201,774 | $ 165,297 | $ 248,256
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |  |  |  |  |
Effective portion of foreign currency hedge net unrealized gains net of taxes |  |  |  |  |  |  |  |  | 0 | 0 | (281)
Reclassification adjustment to net income, net of (taxes) benefit |  |  |  |  |  |  |  |  | 0 | 454 | (119)
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (28,101) | 65,531 | (43,510)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 21,015 | 15,737 | 14,518
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 8,325 | (78,724) | 28,584
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (8,669) | (1,372) | (6,867)
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | 193,105 | 163,925 | 241,389
Hawaiian Electric |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 143,653 | 119,951 | 142,317
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |  |  |  |  |
Effective portion of foreign currency hedge net unrealized gains net of taxes |  |  |  |  |  |  |  |  |  |  | (281)
Reclassification adjustment to net income, net of (taxes) benefit |  |  |  |  |  |  |  |  |  | 454 | (173)
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (26,019) | 63,105 | (42,631)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 19,012 | 14,477 | 13,254
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 8,325 | (78,724) | 28,584
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 1,318 | (688) | (1,247)
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | 144,971 | 119,263 | 141,070
Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 24,481 | 20,146 | 21,255
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |  |  |  |  |
Effective portion of foreign currency hedge net unrealized gains net of taxes |  |  |  |  |  |  |  |  |  |  | 0
Reclassification adjustment to net income, net of (taxes) benefit |  |  |  |  |  |  |  |  |  | 0 | 0
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (6,090) | 3,093 | (5,141)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 2,819 | 1,903 | 1,718
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 3,305 | (4,994) | 3,269
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 34 | 2 | (154)
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | 24,515 | 20,148 | 21,101
Maui Electric Company, Limited (MECO) |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 20,912 | 17,911 | 21,136
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |  |  |  |  |
Effective portion of foreign currency hedge net unrealized gains net of taxes |  |  |  |  |  |  |  |  |  |  | 0
Reclassification adjustment to net income, net of (taxes) benefit |  |  |  |  |  |  |  |  |  | 0 | 0
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (5,004) | 7,329 | (5,447)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 2,423 | 1,619 | 1,549
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 2,788 | (9,003) | 3,852
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 207 | (55) | (46)
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | 21,119 | 17,856 | 21,090
Other subsidiaries |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |  |  |  |  |
Effective portion of foreign currency hedge net unrealized gains net of taxes |  |  |  |  |  |  |  |  |  |  | 0
Reclassification adjustment to net income, net of (taxes) benefit |  |  |  |  |  |  |  |  |  | 0 | 0
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 0 | 0 | 0
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 0 | 0 | 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | 0 | 0 | 0
Consolidating adjustments |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | (45,393) | (38,057) | (42,391)
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |  |  |  |  |
Effective portion of foreign currency hedge net unrealized gains net of taxes |  |  |  |  |  |  |  |  |  |  | 0
Reclassification adjustment to net income, net of (taxes) benefit |  |  |  |  |  |  |  |  |  | 0 | 0
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 11,094 | (10,422) | 10,588
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (5,242) | (3,522) | (3,267)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (6,093) | 13,997 | (7,121)
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (241) | 53 | 200
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | (45,634) | (38,004) | (42,191)
HECO Consolidated |  |  |  |  |  |  |  |  |  |  |
Net income for common stock | $ 35,297 | $ 49,712 | $ 31,169 | $ 27,475 | $ 25,355 | $ 47,487 | $ 25,644 | $ 21,465 | 143,653 | 119,951 | 142,317
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |  |  |  |  |
Effective portion of foreign currency hedge net unrealized gains net of taxes |  |  |  |  |  |  |  |  | 0 | 0 | (281)
Reclassification adjustment to net income, net of (taxes) benefit |  |  |  |  |  |  |  |  | 0 | 454 | (173)
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (26,019) | 63,105 | (42,631)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 19,012 | 14,477 | 13,254
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 8,325 | (78,724) | 28,584
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 1,318 | (688) | (1,247)
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | $ 144,971 | $ 119,263 | $ 141,070

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