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Contractual interest rate for funds borrowed, under the debt agreement.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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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.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum amount borrowed under the credit facility at any time during the period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Senior Debt - Additional Information (Detail) - USD ($)			12 Months Ended
Senior Debt - Additional Information (Detail) - USD ($)	Mar. 08, 2018	Oct. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2019	Mar. 31, 2019	Oct. 30, 2017	Sep. 03, 2015
Line Of Credit Facility [Line Items]
Prepayment of outstanding debt			$ 4,300,000
Credit facility, principal payment 2018			8,500,000
Credit facility, principal payment 2019			10,000,000
Credit facility, principal payment 2020			$ 96,400,000
Credit facility, date of amendment		Oct. 31, 2017	Jun. 09, 2017
Maximum consolidated leverage ratio		375.00%						325.00%
Weighted average interest rate on outstanding borrowings			4.08%	3.26%
Interest rate swap, fair value, asset			$ 300,000
Interest rate swap, fair value, liability				$ 200,000
Changes in fair value income (loss)				500,000
ING Bank N.V. ("Aarding") [Member]
Line Of Credit Facility [Line Items]
Total borrowing capacity			$ 15,500,000
Maximum debt as proportion of EBITDA			3.00%
ING Bank N.V. ("Aarding") [Member] \| Bank Overdrafts [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			$ 2,800,000	$ 0
Weighted average interest rate on outstanding borrowings			1.95%	1.95%
Total borrowing capacity			$ 7,200,000
Debt instrument variable interest rate description			Three months Euribor plus 195 basis points		Three months Euribor plus 195 basis points
Subsequent Event [Member] \| ING Bank N.V. ("Aarding") [Member] \| Bank Overdrafts [Member]
Line Of Credit Facility [Line Items]
Settled outstanding amount of credit facility	$ 2,800,000
Minimum [Member] \| ING Bank N.V. ("Aarding") [Member]
Line Of Credit Facility [Line Items]
Borrowers solvency ratio			30.00%
Cross Currency Interest Rate Contract [Member] \| Minimum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			2.00%
Cross Currency Interest Rate Contract [Member] \| Maximum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			3.00%
Federal Funds Rate [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			0.50%
One-Month LIBOR [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			1.00%
Base Rate [Member] \| Minimum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			1.00%
Base Rate [Member] \| Maximum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			2.00%
Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Unused credit availability under credit facility			$ 54,600,000	$ 62,000,000
Credit Agreement [Member] \| Netherlands and China Facilities [Member]
Line Of Credit Facility [Line Items]
Unused credit availability under credit facility			13,500,000	11,400,000
Debenture Agreement [Member] \| Germany [Member]
Line Of Credit Facility [Line Items]
Cash deposit			200,000	900,000
Scenario Forecast [Member]
Line Of Credit Facility [Line Items]
Maximum consolidated leverage ratio						325.00%	350.00%
Term Loan [Member]
Line Of Credit Facility [Line Items]
Increased credit facility commitment for either revolving credit facility or term loan facility									$ 170,000,000
U.S. Dollar Revolving Loans [Member]
Line Of Credit Facility [Line Items]
Decreased credit facility commitment for either revolving credit facility or term loan facility									60,500,000
Multi-currency Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities									$ 19,500,000
Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			24,400,000	18,000,000
Letters of Credit [Member] \| Netherlands and China Facilities [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			3,900,000	5,300,000
Bank Guarantee Facility [Member] \| Singapore [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			1,000,000	1,700,000
Cash deposit			100,000	300,000
Bank Guarantee Facility [Member] \| ING Bank N.V. ("Aarding") [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			$ 3,900,000	$ 5,300,000
Weighted average interest rate on outstanding borrowings			2.65%	2.65%
Total borrowing capacity			$ 8,300,000
Debt instrument variable interest rate description			Three months Euribor plus 265 basis points		Three months Euribor plus 265 basis points
China Facility [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			$ 0	$ 1,300,000
Total borrowing capacity			$ 4,600,000	4,300,000
Interest rate			4.79%
Credit facility expiration date			Apr. 12, 2018
Letter Of Credit And Bank Guarantees [Member] \| Debenture Agreement [Member] \| United Kingdom [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			$ 8,000,000	9,000,000
Outstanding stand-by letters of credit and bank guarantees			7,000,000	6,200,000
Letter Of Credit And Bank Guarantees [Member] \| Debenture Agreement [Member] \| Germany [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			200,000	900,000
Outstanding stand-by letters of credit and bank guarantees			$ 200,000	$ 900,000