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Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current Income Tax Expense |  |  |  |
Federal |  | $ (845) | $ 2,803 | $ (4,898)
State |  | 660 | 492 | 2,053
Other |  | (47) | (71) | (71)
Total current income tax expense |  | (232) | 3,224 | (2,916)
Deferred Income Tax Expense (1) |  |  |  |
Total deferred income tax expense | [1] | 21,226 | 11,085 | 31,257
Total Income Tax Expense |  | 20,994 | 14,309 | 28,341
Property, plant and equipment |  |  |  |
Deferred Income Tax Expense (1) |  |  |  |
Total deferred income tax expense |  | 19,164 | 8,314 | 31,062
Deferred gas costs |  |  |  |
Deferred Income Tax Expense (1) |  |  |  |
Total deferred income tax expense |  | (1,435) | 2,002 | 1,163
Pensions and other employee benefits |  |  |  |
Deferred Income Tax Expense (1) |  |  |  |
Total deferred income tax expense |  | 463 | 180 | 237
FPU merger related premium cost and deferred gain |  |  |  |
Deferred Income Tax Expense (1) |  |  |  |
Total deferred income tax expense |  | (528) | (1,148) | (572)
Net operating loss carryforwards |  |  |  |
Deferred Income Tax Expense (1) |  |  |  |
Total deferred income tax expense |  | (331) | 193 | (9)
Other |  |  |  |
Deferred Income Tax Expense (1) |  |  |  |
Total deferred income tax expense |  | $ 3,893 | $ 1,544 | $ (624)
[1] | (1) Includes $3.5 million, $873,000 and $2.1 million of deferred state income taxes for the years 2018, 2017 and 2016, respectively.

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