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Savings, Pension and Other Postretirement Employee Benefit Plans - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Defined Contribution Pension Plan 401k
Dec. 31, 2010
Defined Contribution Pension Plan 401k
Dec. 31, 2009
Defined Contribution Pension Plan 401k
Dec. 31, 2011
Red zone
Maximum
Dec. 31, 2011
Yellow zone
Maximum
Dec. 31, 2011
Green zone
Minimum
Dec. 31, 2011
IAM
Dec. 31, 2010
IAM
Nov. 30, 2011
USW
Oct. 31, 2011
USW
Dec. 31, 2011
PENSION BENEFIT PLANS
Dec. 31, 2011
PENSION BENEFIT PLANS
Dec. 31, 2010
PENSION BENEFIT PLANS
Dec. 31, 2009
PENSION BENEFIT PLANS
Dec. 31, 2011
PENSION BENEFIT PLANS
Cash and cash equivalents
Dec. 31, 2010
PENSION BENEFIT PLANS
Cash and cash equivalents
Dec. 31, 2011
PENSION BENEFIT PLANS
Cash and cash equivalents
Fair Value, Inputs, Level 1
Dec. 31, 2010
PENSION BENEFIT PLANS
Cash and cash equivalents
Fair Value, Inputs, Level 1
Dec. 31, 2011
OTHER POSTRETIREMENT EMPLOYEE BENEFIT PLANS
Dec. 31, 2010
OTHER POSTRETIREMENT EMPLOYEE BENEFIT PLANS
Dec. 31, 2009
OTHER POSTRETIREMENT EMPLOYEE BENEFIT PLANS
Dec. 31, 2011
OTHER POSTRETIREMENT EMPLOYEE BENEFIT PLANS
Cash and cash equivalents
Fair Value, Inputs, Level 1
Dec. 31, 2011
Company-Sponsored Pension Plans
Dec. 31, 2010
Company-Sponsored Pension Plans
Dec. 31, 2011
Non Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]                                                        
Employer contributions       $ 8,100,000 $ 5,700,000 $ 5,500,000                                            
Loss related to plan changes in Net Periodic Benefit Cost 4,869,000 6,560,000 6,339,000                     (2,800,000)   (200,000)                        
Decrease in pension liability                           400,000   14,200,000                        
Funded percentage of pension protection plan             65.00% 80.00% 80.00%                                      
Contribution rates                   3.00 2.75 2.6714 2.4285                              
Net Loss, expected to be recognized as a component of net periodic benefit over the next fiscal year                             11,800,000                          
Prior service cost, expected to be recognized as a component of net periodic benefit cost over the next fiscal year                             600,000             (1,800,000)            
Medicare Part D subsidies received                                           355,000 697,000          
Assumed health care cost trend rates used to determine the company's benefit obligations and expense                                           7.50% 8.00%          
Assumed health care cost trend rates, graded rate                                           4.70%            
Expected year when trend rate to be reached                                           60 years            
Securities lending agreement, percentage of market value of loaned securities and accrued interest                                           102.00%            
Value of corporate common stocks loaned under the lending agreement                                           8,100,000            
Fair value of plan assets                           218,557,000 218,557,000 216,650,000 182,477,000 9,843,000 12,631,000 9,843,000 12,631,000 18,000 16,000 14,000 18,000      
Funded status                           (89,101,000) (89,101,000) (55,362,000)           (136,692,000) (141,503,000)     (89,100,000) (55,400,000)  
Employer contribution                             12,752,000 25,351,000                   12,500,000    
Expected contributions to defined benefit plan                                                       300,000
Expected contributions to defined benefit plan in 2012                           $ 20,000,000 $ 20,000,000