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

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration