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Senior Debt - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |

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