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Short-term and long-term debt - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended | 3 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2013 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 GBP (£) | Feb. 15, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jun. 22, 2012 USD ($) | Dec. 31, 2013 Subsequent Event GBP (£) | Sep. 30, 2013 Minimum | Sep. 30, 2013 Maximum | Feb. 15, 2013 Term Loan USD ($) | Jun. 22, 2012 Term Loan USD ($) | Dec. 31, 2013 Term Loan Base Rate | Dec. 31, 2013 Term Loan Eurodollar | Feb. 15, 2013 Revolving Credit Facility USD ($) | Jun. 22, 2012 Revolving Credit Facility USD ($) | Dec. 31, 2013 Revolving Credit Facility Base Rate | Dec. 31, 2013 Revolving Credit Facility Eurodollar | Dec. 31, 2013 Mortgage Note | Jun. 01, 2012 Mortgage Note USD ($) | Dec. 31, 2013 Vehicle And Equipment Loans Minimum | Dec. 31, 2013 Vehicle And Equipment Loans Maximum
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under PNC facility |  |  |  | $ 40,000,000 |  | $ 27,000,000 |  |  |  | $ 4,000,000 | $ 4,000,000 |  |  | $ 36,000,000 | $ 23,000,000 |  |  |  | $ 855,000 |  |
Fees and expenses relating to creation of PNC facility | 150,000 | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding under PNC facility | 19,080,000 | 19,080,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing under PNC facility | 8,349,000 | 8,349,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PNC Facility effective rate of interest | 3.00% | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 2.90% | 8.90%
Interest rate description under PNC facility |  | Interest charges with respect to loans are computed on the actual principal amount of loans outstanding during the month at a rate per annum equal to (A) with respect to domestic rate loans, the sum of (i) a rate per annum equal to the higher of (1) the base commercial lending rate of PNC, (2) the federal funds open rate plus .5% and (3) the daily LIBOR plus 1%, plus (ii) .5% and (B) with respect to Eurodollar rate loans, the sum of the Eurodollar rate plus 2.75%. | Interest charges with respect to loans are computed on the actual principal amount of loans outstanding during the month at a rate per annum equal to (A) with respect to domestic rate loans, the sum of (i) a rate per annum equal to the higher of (1) the base commercial lending rate of PNC, (2) the federal funds open rate plus .5% and (3) the daily LIBOR plus 1%, plus (ii) .5% and (B) with respect to Eurodollar rate loans, the sum of the Eurodollar rate plus 2.75%. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PNC facility spread rate for calculation of interest |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 2.75% |  |  | 1.00% | 2.75% |  |  |  |
Production and importation permission from government agency, amount |  |  | 63,000,000 |  |  |  | 51,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  | 1.00 | 1.10 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  | Base Rate plus one percent | Eurodollar Rate plus two and three quarters of one percent |  |  | Base Rate plus one percent | Eurodollar Rate plus two and three quarters of one percent |  |  |  |
PNC credit Facility expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2017 |  |  |
Principal balance of this mortgage note | 603,000 | 603,000 |  |  | 764,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital leased assets gross | 60,000 | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Before Interest Taxes Depreciation And Amortization | (2,010,000) | 2,010,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest, Total |  | 2,154,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Taxes Depreciation And Amortization |  | $ 144,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of production and importation permission from government agency during the period for the entire US market. + References No definition available. + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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