XML 113 R51.htm IDEA: XBRL DOCUMENT v2.4.0.8
Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]                      
Net deferred tax assets (liabilities) $ (720,566,000)       $ (736,226,000)       $ (720,566,000) $ (736,226,000)  
Valuation allowance on the deferred compensation plan 3,000,000               3,000,000    
Deductible limit 1,000,000               1,000,000    
Regular net operating loss carryforwards 354,200,000               354,200,000    
Alternative minimum tax carryforwards 304,700,000               304,700,000    
Deferred tax asset related to regular NOL 39,000,000               39,000,000    
Accrued interest or penalties related to tax amounts 0               0    
Total income tax (28,323,000) 11,866,000 97,494,000 (47,180,000) 29,964,000 (29,074,000) 39,007,000 (27,843,000) 33,857,000 12,054,000 35,557,000
Minimum
                      
Income Taxes [Line Items]                      
Period during which net operating loss carryforwards and alternative minimum tax expire                 Dec. 31, 2018    
Maximum
                      
Income Taxes [Line Items]                      
Period during which net operating loss carryforwards and alternative minimum tax expire                 Dec. 31, 2033    
Deferred compensation plan
                      
Income Taxes [Line Items]                      
Valuation allowance on the deferred compensation plan 11,400,000               11,400,000    
Capital loss carryforwards
                      
Income Taxes [Line Items]                      
Valuation allowance on the deferred compensation plan 363,000               363,000    
2014
                      
Income Taxes [Line Items]                      
Expect to utilize federal net operating loss carryforwards                 250,000,000    
Expect to utilize alternative minimum tax net operating loss carryforwards                 245,000,000    
Alternative Minimum Tax
                      
Income Taxes [Line Items]                      
AMT credit carryforwards that are not subject to limitation or expiration 665,000               665,000    
Current
                      
Income Taxes [Line Items]                      
Deferred tax liability related to net deferred hedging gains included in AOCI $ 3,987,000       $ 49,124,000       $ 3,987,000 $ 49,124,000