Changes in Unrecognized Tax Positions (Detail) (USD $) In Thousands	9 Months Ended
Sep. 30, 2011
Income Taxes [Line Items]
Unrecognized tax positions, beginning balance	$ 9,132
Gross increases- prior period tax positions	61
Gross increases- current period tax positions	1,972
Settlement	(108)
Expiration of the Statute of Limitations	(1,209)
Unrecognized tax positions, Ending Balance	$ 9,848

Income Taxes [Line Items]

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- Definition

The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

+ References

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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