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Sale of Subsidiary to J-Devices (Details)
3 Months Ended 9 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2014
J-Devices [Member]
USD ($)
Sep. 30, 2014
J-Devices [Member]
Dec. 31, 2013
J-Devices [Member]
Apr. 30, 2013
J-Devices [Member]
Mar. 31, 2013
J-Devices [Member]
Jun. 30, 2014
Amkor Iwate Company Ltd [Member]
USD ($)
Jun. 30, 2014
Amkor Iwate Company Ltd [Member]
JPY (¥)
Jun. 30, 2014
Amkor Iwate Company Ltd [Member]
USD ($)
Sep. 30, 2014
Amkor Iwate Company Ltd [Member]
USD ($)
Sep. 30, 2014
Amkor Iwate Company Ltd [Member]
JPY (¥)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Sale of Stock, Percentage of Ownership before Transaction                   100.00% 100.00%      
Equity Method Investment, Ownership Percentage           60.00% 60.00% 60.00% 30.00%          
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds                     ¥ 1,100,000,000   $ 10,400,000  
Proceeds from Divestiture of Interest in Consolidated Subsidiaries                   1,000,000 100,000,000      
Proceeds to Be Received from Divestiture of Interest in Consolidated Subsidiaries                         9,400,000 1,000,000,000
Gain (Loss) on Disposition of Business 0 0 9,155,000 0               9,200,000    
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)                       12,600,000    
Business Combination, Bargain Purchase, Gain Recognized, Amount         14,700,000                  
Proportionate Share Of Investee Bargain Purchase Gain         8,800,000                  
Combined Net Gain from Sale of Subsidiary                       $ 18,000,000