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Long-term Debt - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Jul. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Notes Payable, Other Payables [Member]
TFMC [Member]
Dec. 31, 2011
Notes Payable, Other Payables [Member]
TFMC [Member]
Dec. 31, 2010
Notes Payable, Other Payables [Member]
TFMC [Member]
May 31, 2010
Revolving bank credit facility [Member]
Dec. 31, 2012
Revolving bank credit facility [Member]
Original Maturing January 2012 [Member]
Dec. 31, 2011
Revolving bank credit facility [Member]
Original Maturing January 2012 [Member]
Dec. 31, 2010
Revolving bank credit facility [Member]
Original Maturing January 2012 [Member]
Jan. 31, 2012
Revolving bank credit facility [Member]
Amended and Restated January 2012 [Member]
Dec. 31, 2012
Revolving bank credit facility [Member]
Amended And Restated January 2012 [Member]
Notes Payable, Other Payables [Member]
TFMC [Member]
Debt Instrument [Line Items]                          
Size of credit facility                   $ 37,500,000   $ 30,000,000  
Ownership interest in foreign subsidiaries pledged as collateral                       65.00%  
Revolving bank credit facility borrowed                   2,000,000 3,000,000    
Equivalent borrowed under the credit facility 5,300,000             5,000,000          
Equivalent repaid under the credit facility     2,900,000           2,000,000        
Interest rate outstanding under the credit facility                   4.40%      
Promissory note, as amended, bears interest at LIBOR plus             1.00%            
Promissory note, as amended, bears interest at LIBOR plus                         1.40%
Promissory note, Variable rate             LIBOR plus 1%            
Quarterly principal repayments             250,000            
Proceeds from (payment to) loan receivable           15,000,000              
Net repayments on the note payable         3,800,000 20,000,000               
Interest expense   $ 303,000 $ 464,000 $ 565,000