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Immaterial Corrections - Additional Information (Detail) (Adjustments [Member], USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2011
Adjustments [Member] |  |
Basic and diluted earnings per share | $ 0.33 | $ 0.32
Basic and diluted earnings per share related to discontinued operations | $ 0.20 | $ 0.20

X
- Definition The amount of income (loss) derived from discontinued operations during the period, net of related tax effect, per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares. + References No definition available. + Details
Name: | us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of net income (loss) before extraordinary items per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares. + References No definition available. + Details
Name: | us-gaap_IncomeLossFromOperationsBeforeExtraordinaryItemsPerBasicAndDilutedShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration