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Summary of Changes in the Fair Value of the Pension Plan Level 3 Assets (Detail) (SEI Core Property Collective Investment Trust Fund, USD $)
 12 Months Ended
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]  
Plan Assets at End of Year $ 1,125,000 [1]
Fair Value, Inputs, Level 3
  
Defined Benefit Plan Disclosure [Line Items]  
Purchases 1,125,000
Plan Assets at End of Year 1,125,000
Amount of Total Gains or Losses for the Year Attributable to the Change in Unrealized Gains or Losses Relating to Assets Still Held at December 31, 2013   
[1] The SEI Core Property Collective Investment Trust Fund, through the SEI Core Property Fund, seeks both current income and long-term capital appreciation through investing in underlying funds that acquire, manage, and dispose of commercial real estate properties.