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Income Taxes - Reconciliation of Beginning and Ending Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits as of January 1	$ 1,231	$ 1,231
Increases due to tax positions taken during prior periods
Increases due to tax positions taken in current period			1,231
Decreases due to settlements with taxing authorities
Reductions due to lapse of applicable statute of limitations
Unrecognized tax benefits as of December 31	$ 1,231	$ 1,231	$ 1,231

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



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

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-Name Accounting Standards Codification

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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

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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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