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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

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