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v3.6.0.2

Senior Debt - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 03, 2015 | Dec. 31, 2014
Line Of Credit Facility [Line Items] |  |  |  |
Prepayment of outstanding debt | $ 31,300,000 |  |  |
Long-term debt, principal payment 2017 | 8,800,000 |  |  |
Long-term debt, principal payment 2018 | 9,800,000 |  |  |
Long-term debt, principal payment 2019 | 11,600,000 |  |  |
Long-term debt, principal payment 2020 | $ 96,100,000 |  |  |
Increased credit facility commitment for either revolving credit facility or term loan facility |  |  |  | $ 50,000,000
Weighted average interest rate on outstanding borrowings | 3.26% | 3.42% |  |
Interest rate swap, fair value | $ 200,000 | $ 400,000 |  |
Changes in fair value income (loss) | $ 500,000 | 400,000 |  |
Maximum consolidated leverage ratio | 375.00% |  |  |
Minimum fixed charge coverage ratio | 125.00% |  |  |
Increased interest rate of loan due to default | 2.00% |  |  |
Decrease in consolidated leverage ratio in next twelve months | 350.00% |  |  |
Decrease in consolidated leverage ratio in year two | 300.00% |  |  |
Decrease in consolidated leverage ratio thereafter | 300.00% |  |  |
ING Bank N.V. ("Aarding") [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Total borrowing capacity | $ 13,700,000 |  |  |
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 | $ 0 | $ 5,300,000 |  |
Weighted average interest rate on outstanding borrowings | 1.95% | 1.95% |  |
Total borrowing capacity | $ 6,300,000 |  |  |
Debt instrument variable interest rate description | Three months Euribor plus 195 basis points | Three months Euribor plus 195 basis points |  |
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 | $ 62,000,000 | $ 56,600,000 |  |
Debenture Agreement [Member] | Germany [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Cash deposit | 900,000 | 700,000 |  |
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 | 35,000,000
U.S. Dollar Revolving Loans [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Increased credit facility commitment for either revolving credit facility or term loan facility |  |  |  | $ 15,000,000
Decreased credit facility commitment for either revolving credit facility or term loan facility |  |  | $ 60,500,000 |
Letters of Credit [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Aggregate principal amount outstanding under the credit facilities | 18,000,000 | 15,400,000 |  |
Bank Guarantee Facility [Member] | Singapore [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Aggregate principal amount outstanding under the credit facilities | 1,700,000 | 1,500,000 |  |
Cash deposit | 300,000 | 500,000 |  |
Bank Guarantee Facility [Member] | ING Bank N.V. ("Aarding") [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Aggregate principal amount outstanding under the credit facilities | $ 5,300,000 | $ 6,600,000 |  |
Weighted average interest rate on outstanding borrowings | 2.65% | 2.65% |  |
Total borrowing capacity | $ 7,400,000 |  |  |
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 | $ 1,300,000 | $ 1,400,000 |  |
Total borrowing capacity | $ 4,300,000 | 4,500,000 |  |
Interest rate | 4.79% |  |  |
Debt instrument maturity period | 2017-02 |  |  |
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 | $ 9,000,000 | 9,000,000 |  |
Outstanding stand-by letters of credit and bank guarantees | 6,200,000 | 5,800,000 |  |
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 | 900,000 | 1,200,000 |  |
Outstanding stand-by letters of credit and bank guarantees | $ 900,000 | $ 1,200,000 |  |

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