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Senior Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Jul. 12, 2016 | Sep. 30, 2015 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2016
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Prepayment of outstanding debt |  |  |  |  | $ 4,300,000 |  |  |
Credit facility, principal payment remainder of 2017 |  |  |  |  | 2,000,000 |  |  |
Credit facility, principal payment 2018 |  |  |  |  | 8,500,000 |  |  |
Credit facility, principal payment 2019 |  |  |  |  | 10,000,000 |  |  |
Credit facility, principal payment 2020 |  |  |  |  | $ 97,400,000 |  |  |
Weighted average interest rate on outstanding borrowings |  |  |  |  | 3.60% |  |  | 3.26%
Interest rate swap, fair value |  |  |  |  |  |  |  | $ 200,000
Changes in fair value income (loss) |  |  |  | $ 500,000 |  |  |  |
Credit facility, date of amendment | Oct. 31, 2017 |  |  |  | Jun. 09, 2017 |  |  |
Maximum consolidated leverage ratio |  |  |  |  | 325.00% |  |  |
ING Bank N.V. ("Aarding") [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Total borrowing capacity |  |  |  |  | $ 15,400,000 |  |  | 15,400,000
ING Bank N.V. ("Aarding") [Member] | Bank Overdrafts [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Total outstanding borrowings under Credit Facility |  |  |  |  | $ 1,600,000 |  |  | 0
Peerless Propulsys [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Ownership interest in the equity and earnings |  | 100.00% |  |  |  |  |  |
Peerless Propulsys [Member] | PMFG, Inc. [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 1.50% |  |  |
Noncontrolling interest, ownership percentage by parent |  |  | 60.00% |  |  |  |  |
Percentage of ownership by parent in net income loss |  |  | 80.00% |  |  |  |  |
Promissory note issued in exchange for ownership in equity |  | $ 5,300,000 |  |  |  |  |  |
Promissory note due date |  |  |  |  | Jul. 11, 2019 |  |  |
Ownership interest in the equity and earnings |  |  |  |  | 100.00% |  |  |
Notes payable amount outstanding |  |  |  |  | $ 5,300,000 |  |  | 5,300,000
Debt Instrument, Term |  |  |  |  | 30 days |  |  |
Notes payable description |  |  |  |  | The note is payable at the earlier of July 11, 2019 or 30 days subsequent to the sale of building and land that the Company owns in China. |  |  |
Building and land expected for sale, period |  |  |  |  | 1 year |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio | 375.00% |  |  |  |  |  |  |
Scenario Forecast [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio |  |  |  |  |  | 325.00% | 350.00% |
Credit Agreement [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Unused credit availability under credit facility |  |  |  |  | $ 57,200,000 |  |  | 62,000,000
Letters of Credit [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  | 20,800,000 |  |  | 18,000,000
Bank Guarantee Facility [Member] | ING Bank N.V. ("Aarding") [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the bank gaurantee |  |  |  |  | 4,600,000 |  |  | 5,300,000
China Facility [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Total borrowing capacity |  |  |  |  | $ 4,500,000 |  |  | $ 4,300,000
Interest rate |  |  |  |  |  |  |  | 4.79%
China Facility [Member] | US Dollar Borrowings [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Total outstanding borrowings under Credit Facility |  |  |  |  |  |  |  | $ 1,296,000

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