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Fair Value of Pension Plan Investments Estimated using Net Asset Value (Detail) (SEI Core Property Collective Investment Trust Fund, USD $)
12 Months Ended
Dec. 31, 2013
SEI Core Property Collective Investment Trust Fund
 
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value $ 1,125,000 [1]
Unfunded Commitment    [1]
Redemption on Frequency Quarterly [1]
Redemption on Notice Period 65 days [1]
[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.