Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Differences between the Financial Statement and Tax Bases of Assets and Liabilities (Detail)

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Income Taxes - Summary of Differences between the Financial Statement and Tax Bases of Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred Tax Assets:    
Basis difference in fixed assets $ 31,440 $ 30,619
Foreign tax credit carry forward 55,908 23,836
Alternative minimum tax credit carryover 1,349 1,349
Foreign net operating losses 42,688 38,782
Asset retirement obligations 4,012 3,629
Other 3,300 2,731
Deferred Tax Assets, Gross 138,697 100,946
Valuation allowance (137,348) (99,597)
Total deferred tax asset $ 1,349 $ 1,349