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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 |
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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 |  |  |  |  |  |  |  |  |

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- Definition Percentage Ownership Of Foreign Subsidiaries Pledged As Collateral Revise. + References No definition available. + Details
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- Definition Decrease for amounts repaid on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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