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Income Taxes - Schedule of Net Operating Losses for Tax Purposes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Beginning NOL $ (136,515) $ (106,939) $ (101,856)
U.S. GAAP income 51,537 11,030 3,092
Temporary tax differences 5,580 (5,633) 209
Permanent tax differences (61,561) (37,618) (9,334)
Net operating losses expired   2,645 950
Ending NOL $ (140,959) $ (136,515) $ (106,939)