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Deferred Tax Assets and Liabilities Result from Differences in Timing of Recognition of Certain Income and Expense Items for Tax and Financial Accounting Purposes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred income tax assets:    
Net operating loss carryforwards $ 148,499 $ 99,021
Foreign tax credits 27,240 19,359
Compensation 24,902 20,668
Deferred revenue 10,564 13,281
Tax basis in investments 15,536 17,723
Other 15,144 8,444
Gross deferred income tax assets 241,885 178,496
Less: valuation allowance (39,749) (37,941)
Net deferred income tax assets 202,136 140,555
Deferred income tax liabilities:    
Depreciation and amortization (117,444) (57,957)
Total deferred income tax liabilities (117,444) (57,957)
Net deferred income taxes 84,692 82,598
Deferred income taxes / liabilities included in the balance sheet are:    
Deferred income tax asset - current 47,593 34,342
Deferred income tax asset - noncurrent 48,852 63,370
Deferred income tax liability - current (753) (174)
Deferred income tax liability - noncurrent (11,000) (14,940)
Net deferred income taxes $ 84,692 $ 82,598