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Expected Long Term Rates of Return on Different Asset Classes (Detail)	12 Months Ended
	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Equity - Expected long-term return per annum	6.60%
Bonds - Expected long-term return per annum	4.70%

X

- Definition

Rate Of Return On Debt Securities

+ References

No definition available.

+ Details

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X

- Definition

Rate of Return on Equity Securities

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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