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Long-Term Debt - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 28, 2013
Senior Convertible Notes due 2017
Mar. 31, 2013
Senior Convertible Notes due 2017
Mar. 06, 2012
Senior Convertible Notes due 2017
Mar. 31, 2013
Bank Debt
Apr. 26, 2011
Bank Debt
Mar. 31, 2013
Bank Credit Facility
May 02, 2013
Bank Credit Facility
Subsequent Event
Mar. 31, 2013
Letter of Credit
May 02, 2013
Letter of Credit
Subsequent Event
Mar. 31, 2013
8.625 % Senior Notes Due 2017
Mar. 31, 2013
Seven Point Five Percent Senior Notes Due Two Thousand Twenty Two [Member]
Mar. 31, 2013
7.5% Senior Notes due 2022
Debt Instrument [Line Items]                        
Credit facility initial date       Apr. 26, 2011                
Redetermined base borrowing and credit facility         $ 700              
Maturity of new credit facility if note issue under 2004 indenture are retired on or before April 15, 2014           Apr. 26, 2015            
Initial bank and availability under facility       400.0   379.0 379.0          
Outstanding borrowing under bank credit facility           0 0 21.0 21.0      
Oil and gas reserve as proportion of discounted present value of future net cash flow, for mortgage       80.00%                
Aggregate principal amount of Senior Subordinated Notes     300                  
Initial conversion rate of convertible note 2017   An initial conversion rate of 23.4449 shares of our common stock per $1,000 principal amount of 2017 Convertible Notes                    
Initial conversion price of convertible note 2017   $ 42.65                    
Closing share price $ 21.75                      
Payment for call option   70.8                    
Anti-dilution adjustments for purchases of call option   7,033,470                    
Strike price per share   $ 55.91                    
Proceeds from sale of warrants   40.1                    
Carrying amount of liability component   229.2                    
Effective market interest rate   7.51%                    
Carrying amount of equity component   70.8                    
Transaction costs allocated to liability and equity components   8.9                    
Proceeds from warrant transaction   40.1                    
Liability component of convertible note   242.3                    
Interest cost related to amortization of discount   3.1                    
Amortization of deferred financing cost   0.3               0.4 0.2  
Interest expense related to contractual interest coupon of convertible notes   $ 1.3               $ 8.1   $ 5.6