Revolving Term Credit Facilities and Debt - Additional Information - PM Group Term Loans (Detail)
€ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Bank
Payment
Dec. 31, 2016
EUR (€)
Payment
Dec. 31, 2016
EUR (€)
Bank
Jan. 15, 2015
USD ($)
Jan. 15, 2015
EUR (€)
Line of Credit Facility [Line Items]          
Debt issuance cost $ 1,561        
Interest rates swaps, fair value 405        
Italy [Member]          
Line of Credit Facility [Line Items]          
Debt issuance cost 431        
Interest rates swaps, fair value 405        
Non Interest Bearing Promissory Note          
Line of Credit Facility [Line Items]          
Debt Instrument, fair value 835        
Non Interest Bearing Promissory Note | Italy [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, fair value 835        
PM Group [Member] | Interest Rate Swap Contracts [Member]          
Line of Credit Facility [Line Items]          
Interest rates swaps, fair value 405   € 384    
PM Group [Member] | Unsecured Debt          
Line of Credit Facility [Line Items]          
Bank Loans $ 13,733   € 13,015    
Debt Instrument, Basis Spread on Variable Rate 2.50% 2.50%      
Debt Instrument, Interest Rate, Effective Percentage 2.18%   2.18%    
Debt Instrument, Frequency of periodic payment Semi-annual basis Semi-annual basis      
Debt instrument, semi installment payable start date 2019-06 2019-06      
Debt instrument, semi installment payable end date 2021-12 2021-12      
Accrued interest       $ 378 € 358
Accrued Interest, Frequency of Periodic Payment Semi-annual Semi-annual      
Debt instrument, Accrued interest semi installment payable start date 2019-06 2019-06      
Debt instrument, Accrued interest semi installment payable end date 2019-12 2019-12      
PM Group [Member] | Unsecured Debt | Italy [Member]          
Line of Credit Facility [Line Items]          
Number of Italian banks | Bank 4   4    
PM Group [Member] | First note [Member] | Notes Payable to Banks [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage 3.00%   3.00%    
Number of payments | Payment 60 60      
Debt Instrument, Periodic Payment $ 9 € 8      
Debenture, maturity date Oct. 31, 2020 Oct. 31, 2020      
Notes Payable $ 410   € 389    
PM Group [Member] | First note [Member] | 1-month Euribor [Member] | Notes Payable to Banks [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 3.00% 3.00%      
PM Group [Member] | Second note [Member] | Notes Payable to Banks [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage 2.50%   2.50%    
Number of payments | Payment 1 1      
Debenture, maturity date Jun. 30, 2017 Jun. 30, 2017      
Notes Payable $ 464   € 440    
PM Group [Member] | Second note [Member] | 1-month Euribor [Member] | Notes Payable to Banks [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.50% 2.50%      
PM Group [Member] | Bank Term Loan Facility [Member]          
Line of Credit Facility [Line Items]          
Bank Loans $ 12,706   12,041    
Debt issuance cost 431   408    
PM Group [Member] | Bank Term Loan Facility [Member] | First note [Member]          
Line of Credit Facility [Line Items]          
Bank Loans $ 4,189   € 3,970    
Debt Instrument, Interest Rate, Effective Percentage 2.14%   2.14%    
Debt Instrument, Frequency of periodic payment Semi-annual Semi-annual      
Debt instrument, semi installment payable start date 2017-06 2017-06      
Debt instrument, semi installment payable end date 2021-12 2021-12      
PM Group [Member] | Bank Term Loan Facility [Member] | First note [Member] | 6-month Euribor [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.36% 2.36%      
PM Group [Member] | Bank Term Loan Facility [Member] | Second note [Member]          
Line of Credit Facility [Line Items]          
Bank Loans $ 5,134   € 4,865    
Debt Instrument, Interest Rate, Effective Percentage 2.64%   2.64%    
Debt Instrument, Frequency of periodic payment Semi-annual Semi-annual      
Debt instrument, semi installment payable start date 2017-06 2017-06      
Debt instrument, semi installment payable end date 2021-12 2021-12      
PM Group [Member] | Bank Term Loan Facility [Member] | Second note [Member] | 6-month Euribor [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.86% 2.86%      
PM Group [Member] | Bank Term Loan Facility [Member] | Non Interest Bearing Promissory Note          
Line of Credit Facility [Line Items]          
Bank Loans $ 3,383   € 3,206    
Debt Instrument, Frequency of periodic payment Semi-annual Semi-annual      
Debt instrument, semi installment payable start date 2016-06 2016-06      
Debt instrument, semi installment payable end date 2017-12 2017-12      
Debt instrument, final balloon payment date 2022-12 2022-12      
PM Group [Member] | Bank Term Loan Facility [Member] | Non Interest Bearing Debt Adjustment [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, fair value $ 836   € 792 $ 1,641 € 1,460