v2.4.1.9

INVESTMENT IN EQUITY METHOD INVESTEES (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	May 31, 2014	Dec. 31, 2013	Apr. 30, 2013	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Investments in equity method investees	$ 27,352us-gaap_EquityMethodInvestments		$ 17,843us-gaap_EquityMethodInvestments
Beijing Actions [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	45.80%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_ActionsMicroelectronicsCoLtdMember		45.80%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_ActionsMicroelectronicsCoLtdMember
Investments in equity method investees	3,332us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_ActionsMicroelectronicsCoLtdMember		2,856us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_ActionsMicroelectronicsCoLtdMember
Nann Capital [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage		40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember		40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember	40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember
Investments in equity method investees	$ 24,020us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember	$ 9,016us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember	$ 14,987us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember	$ 3,712us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ 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 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

+ Details

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X

- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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