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Pension and Employee Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Increase (decrease) in minimum liability after tax of defined benefit plans | $ 100,000 | $ (100,000) | $ 300,000
Current Assets Mix percentage | 100.00% | 100.00% |
Assumed average annual returns | 7.25% | 7.50% | 7.50%
Defined benefit plan change in discount rate projected benefit obligation | $ 1,100,000 |  |
Net Periodic Pension Cost | 9,000 |  |
Defined benefit plan, assumed long-term rate of return on assets | 66,000 |  |
Net periodic benefit cost | $ 233,000 | $ 256,000 | $ (106,000)
Listing under plans Forms 5500 as providing more than 5% contribution | false |  |
Liability has been provided in the accompanying consolidated financial statements | $ 0 |  |
Amounts charged to pension expense | 2,000,000 | 2,100,000 | 1,300,000
Aggregate matching contributions and discretionary contributions Amount | $ 1,600,000 | 1,500,000 | 1,200,000
PMFG, Inc. [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Total cash contribution by employer |  |  | 100,000
Employee Deferral Category One [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Profit sharing and 401(k) savings retirement plan for non-union employees Description | The plan covers substantially all employees who have 30 days of service, and who have attained 18 years of age. |  |
Percentage of Employee salary deferral provision | 100.00% |  |
Yellow Zone |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Plans Funded Status Description | Between 65 and less than 80 percent |  |
Red Zone |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Plans Funded Status Description | Less than 65 percent |  |
Green Zone |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Plans Funded Status Description | At least 80 percent |  |
Pension Plan [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Net loss for the defined benefit pension plan to be amortized in next year | $ 200,000 |  |
Prior service cost for the defined benefit pension plan to be amortized in next year | 2,000 |  |
Estimated pension plan cash obligations payable in 2018 | 1,900,000 |  |
Estimated pension plan cash obligations payable in 2019 | 2,100,000 |  |
Estimated pension plan cash obligations payable in 2020 | 2,200,000 |  |
Estimated pension plan cash obligations payable in 2021 | 2,100,000 |  |
Estimated pension plan cash obligations payable in 2022 | 2,200,000 |  |
Estimated pension plan cash obligations payable in 2023 through 2027 | 10,700,000 |  |
Health Care Plan [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Net loss for the defined benefit pension plan to be amortized in next year | 0 |  |
Prior service cost for the defined benefit pension plan to be amortized in next year | 11,000 |  |
Net periodic benefit cost | $ 11,000 | $ 15,000 | $ 12,000
Weighted average discount rate to determine the net periodic benefit cost | 2.75% | 3.00% | 3.75%
Estimated pension plan cash obligations payable in 2018 | $ 24,000 |  |
Estimated pension plan cash obligations payable in 2019 | 20,000 |  |
Estimated pension plan cash obligations payable in 2020 | 17,000 |  |
Estimated pension plan cash obligations payable in 2021 | 14,000 |  |
Estimated pension plan cash obligations payable in 2022 | 11,000 |  |
Estimated pension plan cash obligations payable in 2023 through 2027 | $ 30,000 |  |
Minimum [Member] | Debt Securities [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 30.00% |  |
Assumed average annual returns | 4.00% |  |
Minimum [Member] | Equity Securities [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 60.00% |  |
Assumed average annual returns | 8.00% |  |
Maximum [Member] | Debt Securities [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 40.00% |  |
Assumed average annual returns | 6.00% |  |
Maximum [Member] | Equity Securities [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 70.00% |  |
Assumed average annual returns | 12.00% |  |

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