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Pension and Employee Benefit Plans - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Plan
Defined Benefit And Contribution Plan Disclosure [Line Items]      
Number Of Defined Benefit Pension Plans, acquired | Plan     2
Increase (decrease) in minimum liability after tax of defined benefit plans $ (300,000) $ 4,000,000 $ (1,400,000)
Current Assets Mix percentage 100.00% 100.00%  
Assumed average annual returns 7.50% 7.50% 7.50%
Defined benefit plan change in discount rate projected benefit obligation $ 1,100,000    
Annual pension expense 2,000    
Defined benefit plan, expected return on plan assets 61,000    
Net periodic benefit cost $ (106,000) $ (141,000) $ 301,000
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 1,300,000 1,200,000 1,400,000
Aggregate matching contributions and discretionary contributions Amount 1,200,000 1,100,000 400,000
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.    
Description Increase in matching contributions We increased, effective January 1, 2008, the matching contributions to 100% of the first 1% and 50% of the next 5% of the employee deferral for a maximum match of 3.5%.    
Employer Matching Contribution on First one percent in 2012 & 2013 and three percent in 2014 100.00%    
Employer Matching Contribution on Next Five percent in 2012 & 2013 and three percent in 2014 50.00%    
Employer Matching Contribution per employee on Next percentage 5.00%    
Employer Maximum Matching Contribution Percent Of Employee Salary Deferral 3.50%    
Percentage of Employee salary deferral provision 100.00%    
Employee Deferral Category Two [Member]      
Defined Benefit And Contribution Plan Disclosure [Line Items]      
Employer Matching Contribution on First one percent in 2012 & 2013 and three percent in 2014 100.00%    
Employer Matching Contribution on Next Five percent in 2012 & 2013 and three percent in 2014 50.00%    
Employer Matching Contribution per employee on Next percentage 3.00%    
Employer Maximum Matching Contribution Percent Of Employee Salary Deferral 4.50%    
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 0    
Estimated pension plan cash obligations payable in 2016 1,800,000    
Estimated pension plan cash obligations payable in 2017 1,900,000    
Estimated pension plan cash obligations payable in 2018 1,900,000    
Estimated pension plan cash obligations payable in 2019 2,000,000    
Estimated pension plan cash obligations payable in 2020 2,000,000    
Estimated pension plan cash obligations payable in 2021 through 2025 10,800,000    
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 $ 12,000 $ 0 $ (11,000)
Weighted average discount rate to determine the net periodic benefit cost 3.75% 4.50% 3.75%
Estimated pension plan cash obligations payable in 2016 $ 27,000    
Estimated pension plan cash obligations payable in 2017 24,000    
Estimated pension plan cash obligations payable in 2018 21,000    
Estimated pension plan cash obligations payable in 2019 19,000    
Estimated pension plan cash obligations payable in 2020 16,000    
Estimated pension plan cash obligations payable in 2021 through 2025 $ 52,000    
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%