v2.4.1.9

EMPLOYEE BENEFIT PLAN (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
EMPLOYEE BENEFIT PLAN [Abstract] |  |  |
Multiemployer plans, employer contributions, percentage of employee salaries | 5.00%acts_MultiemployerPlansEmployerContributionsPercentageOfEmployeeSalaries |  |
Multiemployer plan, period contributions | $ 3,929 us-gaap_MultiemployerPlanPeriodContributions | $ 3,084 us-gaap_MultiemployerPlanPeriodContributions | $ 2,717 us-gaap_MultiemployerPlanPeriodContributions

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- Definition Represents the percentage of aggregate employee salaries used to determine the employer's contribution to the plan. + References No definition available. + Details
Name: | acts_MultiemployerPlansEmployerContributionsPercentageOfEmployeeSalaries
Namespace Prefix: | acts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
Name: | us-gaap_MultiemployerPlanPeriodContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration