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Debt and Credit Arrangements - Additional Information (Detail) € in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 14, 2019 USD ($) | Apr. 25, 2019 USD ($) | Mar. 13, 2018 USD ($) | Aug. 22, 2016 | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increased borrowing capacity |  |  | $ 65,000,000 |  |  |  |  |
Extended debt instrument date |  |  | Jun. 30, 2021 | Jun. 30, 2019 |  |  |  |
Debt to earnings before Interest, Taxes and Depreciation ratio |  |  | 225.00% |  |  |  |  |
Line of credit utilized borrowing capacity |  |  |  |  | $ 33,600,000 |  |  |
Line of credit remaining borrowing capacity |  |  |  |  | 31,400,000 |  |  |
Proceeds from long-term debt |  |  |  |  | 93,036,000 | $ 76,030,000 | $ 55,581,000 |
Remaining balance due on loan for purchased corporate aircraft |  |  |  |  | 57,076,000 | 26,408,000 |  |
Remaining balance due on loan for purchased corporate aircraft classified as short-term |  |  |  |  | 12,050,000 | 10,490,000 |  |
Aggregate maturities of long-term debt for 2020 |  |  |  |  | 3,400,000 |  |  |
Aggregate maturities of long-term debt for 2021 |  |  |  |  | 36,400,000 |  |  |
Aggregate maturities of long-term debt for 2022 |  |  |  |  | 2,800,000 |  |  |
Aggregate maturities of long-term debt for 2023 |  |  |  |  | 2,800,000 |  |  |
Aggregate maturities of long-term debt there after |  |  |  |  | 11,700,000 |  |  |
Interest paid |  |  |  |  | 2,000,000 | 1,800,000 | $ 1,000,000 |
Total outstanding guarantees |  |  |  |  | 11,500,000 |  |  |
Letter of credit outstanding |  |  |  |  | 7,600,000 |  |  |
Aircraft [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Remaining balance due on loan for purchased corporate aircraft |  |  |  |  | 9,500,000 |  |  |
Remaining balance due on loan for purchased corporate aircraft classified as short-term |  |  |  |  | $ 1,400,000 |  |  |
Debt instrument expiration year |  |  |  |  | 2026 |  |  |
Subsidiaries [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit utilized borrowing capacity |  |  |  |  | $ 20,000,000 |  |  |
Line of credit remaining borrowing capacity |  |  |  |  | $ 8,000,000 |  |  |
U.S. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate for Line of credit |  |  |  |  | 2.89% |  |  | 2.89%
Asia Pacific [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Restricted cash used to secure bank debt |  |  |  |  | $ 300,000 | $ 300,000 |  |
LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate of LIBOR plus |  |  | 1.125% |  |  |  |  |
LIBOR [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate of LIBOR plus |  |  | 1.50% |  |  |  |  |
Polish Subsidiary [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | $ 6,500,000 |  |  |
Interest rate for Line of credit |  |  |  |  | 2.76% |  |  | 2.76%
Polish Subsidiary [Member] | Warsaw Interbank Offer Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate of LIBOR plus |  |  |  |  | 1.125% |  |  |
Expiration date |  |  |  |  | Jun. 30, 2021 |  |  |
Australian subsidiary [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | $ 5,500,000 |  |  |
Expiration date |  |  |  |  | Jun. 30, 2021 |  |  |
Interest rate for Line of credit |  |  |  |  | 1.96% |  |  | 1.96%
Austrian Subsidiary [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit utilized borrowing capacity |  |  |  |  | $ 1,100,000 |  |  | € 1.0
Expiration date |  |  |  |  | May 31, 2020 |  |  |
Interest rate |  |  |  |  | 3.00% |  |  | 3.00%
Remaining balance due on loan for purchased corporate aircraft |  |  |  |  | $ 100,000 |  |  |
Debt instrument expiration year |  |  |  |  | 2025 |  |  |
Austrian Subsidiary [Member] | Line Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from long-term debt |  |  |  |  | $ 600,000 |  |  |
Interest rate |  |  |  |  | 1.40% |  |  | 1.40%
Indonesian Subsidiary [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit utilized borrowing capacity |  |  |  |  | $ 7,500,000 |  |  |
Expiration date |  | Apr. 30, 2024 |  |  |  |  |  |
Proceeds from long-term debt |  | $ 8,000,000 |  |  |  |  |  |
Interest rate |  | 3.501% |  |  |  |  |  |
Outstanding letters of credit, current |  |  |  |  | 800,000 |  |  |
New Zealand Subsidiary {Member} |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit utilized borrowing capacity |  |  |  |  | 5,400,000 |  |  |
Expiration date | Aug. 26, 2021 |  |  |  |  |  |  |
Proceeds from long-term debt | $ 5,300,000 |  |  |  |  |  |  |
Interest rate | 3.90% |  |  |  |  |  |  |
Outstanding letters of credit, current |  |  |  |  | $ 500,000 |  |  |

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