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Senior Debt - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2016 | Jun. 30, 2017 | Mar. 31, 2019 | Dec. 31, 2016 | Jul. 31, 2016 | Jul. 12, 2016
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Prepayment of outstanding debt | $ 2,000,000 |  | $ 4,300,000 |  |  |  |
Credit facility, principal payment remainder of 2017 | 3,500,000 |  | 3,500,000 |  |  |  |
Credit facility, principal payment 2018 | 8,500,000 |  | 8,500,000 |  |  |  |
Credit facility, principal payment 2019 | 10,000,000 |  | 10,000,000 |  |  |  |
Credit facility, principal payment 2020 | $ 95,300,000 |  | $ 95,300,000 |  |  |  |
Weighted average interest rate on outstanding borrowings | 3.47% |  | 3.47% |  | 3.26% |  |
Interest rate swap, fair value |  |  |  |  | $ 200,000 |  |
Changes in fair value income (loss) |  | $ 500,000 |  |  |  |  |
Credit agreement, date of amendment |  |  | Jun. 09, 2017 |  |  |  |
Maximum consolidated leverage ratio | 325.00% |  | 325.00% |  |  |  |
ING Bank N.V. ("Aarding") [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Total borrowing capacity | $ 14,900,000 |  | $ 14,900,000 |  | 14,900,000 |  |
ING Bank N.V. ("Aarding") [Member] | Bank Overdrafts [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Total outstanding borrowings under Credit Facility | $ 200,000 |  | $ 200,000 |  | 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% |  | 1.50% |  |  |  |
Noncontrolling interest, ownership percentage by parent | 60.00% |  | 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% |  | 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 |  |  |  |
Scenario Forecast [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum consolidated leverage ratio |  |  |  | 300.00% |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Unused credit availability under credit facility | $ 59,300,000 |  | $ 59,300,000 |  | 62,000,000 |  |
Letters of Credit [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | 20,700,000 |  | 20,700,000 |  | 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 | 4,700,000 |  | 4,700,000 |  | 5,300,000 |  |
China Facility [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Total borrowing capacity | $ 4,400,000 |  | $ 4,400,000 |  | $ 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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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