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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