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Other Operating Income and Expense - Additional Information (Detail) (Reclassifications, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Reclassifications
Component of Operating Other Cost and Expense [Abstract]
Adjustment of pre-tax income for the prior periods	$ 2.39

X

- Details

Name:	us-gaap_ComponentOfOperatingOtherCostAndExpenseLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration