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Equity and Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule of Stockholders Equity and Comprehensive Income [Line Items]        
Equity, Beginning balance     $ 964,940 $ 666,794
Net income 50,406 30,329 71,589 44,095
Other comprehensive income (loss) (11,445) (2,824) (7,496) (6,934)
Issuance of stock through employee share-based compensation plans     4,826  
Treasury stock acquired through surrender of shares for tax withholding     (1,006) (172)
Share-based compensation expense     1,847 1,182
Conversion of debt to common stock     56,350  
Exchange of debt for common stock       195,034
Equity, Ending balance 1,091,050 899,999 1,091,050 899,999
Amkor [Member]
       
Schedule of Stockholders Equity and Comprehensive Income [Line Items]        
Equity, Beginning balance     953,740 657,955
Net income     70,154 43,109
Other comprehensive income (loss)     (7,496) (6,934)
Issuance of stock through employee share-based compensation plans     4,826  
Treasury stock acquired through surrender of shares for tax withholding     (1,006) (172)
Share-based compensation expense     1,847 1,182
Conversion of debt to common stock     56,350  
Exchange of debt for common stock       195,034
Equity, Ending balance 1,078,415 890,174 1,078,415 890,174
Noncontrolling Interest [Member]
       
Schedule of Stockholders Equity and Comprehensive Income [Line Items]        
Equity, Beginning balance     11,200 8,839
Net income     1,435 986
Other comprehensive income (loss)     0 0
Issuance of stock through employee share-based compensation plans     0  
Treasury stock acquired through surrender of shares for tax withholding     0 0
Share-based compensation expense     0 0
Conversion of debt to common stock     0  
Exchange of debt for common stock       0
Equity, Ending balance $ 12,635 $ 9,825 $ 12,635 $ 9,825