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OTHER INVESTMENTS (Narrative) (Details) (USD $) In Thousands, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2007
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Dec. 31, 2008
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Dec. 31, 2010
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Sep. 30, 2012
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Dec. 31, 2011
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Apr. 30, 2011
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Mar. 31, 2011
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Feb. 28, 2010
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| Schedule of Equity Method Investments [Line Items] |
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| Number of unlisted entities |
5acts_EquityMethodInvestmentNumberOfUnlistedEntities |
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| Impairment charges |
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$ 681us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet |
$ 2,543us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet |
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| Write down of investments |
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819us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment |
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| Carrying value |
27,352us-gaap_EquityMethodInvestments |
17,843us-gaap_EquityMethodInvestments |
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| AMC [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Ownership percentage |
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5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_AMCHoldingLimitedMember |
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| Capital investment |
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27,000us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_AMCHoldingLimitedMember |
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| Carrying value |
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| Actar [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Ownership percentage |
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7.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_ActarLimitedMember |
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| Capital investment |
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3,000us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_ActarLimitedMember |
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| Carrying value |
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| Hi-Trend [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Ownership percentage |
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10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_HiTrendInvestmentHoldingsCoLtdMember |
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| Capital investment |
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800us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_HiTrendInvestmentHoldingsCoLtdMember |
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| Carrying value |
1,081us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_HiTrendInvestmentHoldingsCoLtdMember |
1,102us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_HiTrendInvestmentHoldingsCoLtdMember |
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| Additional capital |
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202us-gaap_AdditionalPaidInCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_HiTrendInvestmentHoldingsCoLtdMember |
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| Dilution of ownership percentage |
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9.00%acts_EquityMethodInvestmentDilutionOfOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_HiTrendInvestmentHoldingsCoLtdMember |
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| Grand Choice [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Ownership percentage |
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19.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
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12.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
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20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
| Capital investment |
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1,500us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
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600us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
| Carrying value |
819us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
819us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
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804us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
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| Additional capital |
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600us-gaap_AdditionalPaidInCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
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10,000us-gaap_AdditionalPaidInCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
7,986us-gaap_AdditionalPaidInCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
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| Dilution of ownership percentage |
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12.00%acts_EquityMethodInvestmentDilutionOfOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
15.00%acts_EquityMethodInvestmentDilutionOfOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_GrandChoiceInvestmentLimitedMember |
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| OCTT [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Ownership percentage |
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19.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_OCTTAsiaLimitedMember |
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| Capital investment |
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13,727us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_OCTTAsiaLimitedMember |
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| Carrying value |
13,727us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_OCTTAsiaLimitedMember |
13,727us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_OCTTAsiaLimitedMember |
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| Investees One [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Impairment charges |
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803us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_PrivateEntityInvesteesOneMember |
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| Write down of investments |
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1,500us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_PrivateEntityInvesteesOneMember |
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| Investees Two [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Impairment charges |
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1,740us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_PrivateEntitiesInvesteesTwoMember |
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| Write down of investments |
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