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Income taxes (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |  |
Income Tax Examination, Penalties and Interest Accrued |  | $ 800,000 | $ 700,000 |
Income Tax Holiday, Aggregate Dollar Amount |  | 100,000 | 1,100,000 | 100,000
Undistributed Earnings Of Foreign Subsidiaries |  | 32,400,000 |  |
Unrecognized Tax Benefits |  | 2,453,000 | 2,350,000 | 2,278,000
Valuation Allowance, Deferred Tax Asset, Change in Amount | 7,100,000 |  |  |
Valuation Allowance Deferred Tax Asset From Unrealized Losses On Foreign Currency | 700,000 |  |  |
Windfall [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards |  | 4,700,000 |  |
Domestic Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards |  | 17,300,000 |  |
Foreign Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards |  | 18,900,000 |  |
Indian Bureau Of Taxation [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  | 453,000 |  |
Operating Loss Carryforwards Expiration Date 1 |  | These net operating loss carryforwards expire at various times through the year 2033. |  |
Additional Foreign Income Tax Expense Benefit Continuing Operations |  | 1,162,000 |  |
Indian Bureau Of Taxation [Member] | Fiscal Tax Year Ended March 31, 2003 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations |  | 263,000 |  |
Indian Bureau Of Taxation [Member] | Fiscal Tax Year Ended March 31, 2005 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations |  | 285,000 |  |
Indian Bureau Of Taxation [Member] | Fiscal Tax Year Ended March 31, 2006 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations |  | 290,000 |  |
Indian Bureau Of Taxation [Member] | Fiscal Tax Year Ended March 31, 2008 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations |  | 1,000,000 |  |
Philippine Bureau Of Taxation [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Informal Tax Assessment Received Amount |  | $ 3,800,000 |  |

X
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- Definition This element represents that, the amount of informal tax assessment received. + References No definition available. + Details
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- Definition The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates. + References No definition available. + Details
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- Definition This element represent the valuation allowance on deferred tax assets arising from unrealized losses and foreign currency. + References No definition available. + Details
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- Definition Amount of current and deferred income tax expense (benefit) attributable to income (loss) from continuing foreign operations not within the country of domicile of the entity. + 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.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 11.C) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 11 -Section C + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28511-109314 + Details
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- Definition Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479915&loc=d3e66715-112838 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6487024&loc=d3e29054-158556 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 995 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6503627&loc=d3e59836-110443 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28200-109314 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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