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Employment Benefit Plans - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Postretirement and postemployment benefits expense $ 3,445 $ 2,099
Unfunded accumulated postretirement benefit obligation 9,374  
Assumed health care cost trend rates range 8.50%  
One percentage point increase on accumulated postretirement benefit obligation 1,712  
One percentage point decrease on accumulated postretirement benefit obligation 536  
One percentage point increase on accumulated postretirement benefit expense 1,323  
One percentage point decrease on accumulated postretirement benefit expense 399  
Projected plan benefit obligations 4.75% 4.00%
Additional contribution by employer 100.00%  
Additional to base compensation 3.00%  
Employee Savings Incentive Plan cost 1,130 1,058
Common stock authorized for awards 4,000,000  
Gross stock option expense 56 0
Net income effect from stock options 56 0
Compensation cost, expected weighted average period of recognition 3 months 29 days  
Shares outstanding, Restricted stock units 154,186 104,389
Shares outstanding, Equity instruments other than options nonvested 113,921 70,530
Shares outstanding, Equity instruments restricted stock units vested 40,265 33,859
Fair value for RSUs vested 19 0
1997 Equity Plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Stock granted 0 0
2013 Plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Stock granted 0  
Awards granted, vesting period to directors 7 years  
Unvested RSUs granted [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Total unrecognized compensation costs 2,150 0
Compensation cost, expected weighted average period of recognition 8 months 12 days  
Unvested Stock Options [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Total unrecognized compensation costs 444 0
Additions [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Additional contribution by employer 50.00%  
Additional to base compensation 2.00%  
2021 [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Assumed health care cost trend rates range 5.00%  
2013 Plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Common stock authorized for awards 4,000,000  
Common stock available for future grant 3,779,146  
2013 Plan [Member] | Grant Date [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Awards granted, vesting percent 50.00%  
2013 Plan [Member] | First Anniversary of Grant Date [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Awards granted, vesting percent 50.00%  
Restricted Stock Units (RSUs) [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Gross restricted stock units expense 1,051 0
Restricted stock units expense, net of tax $ 1,051 $ 0