Changes in Unrecognized Tax Benefit (Including Interest and Penalties) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits [Line Items]
Beginning Balance	$ 780
Additions for tax positions for prior years	347
Reduction for tax positions for prior years	(25)
Reduction as a result of a lapse of the applicable statute of limitations	(658)
Ending Balance	444
Reconciliation of Unrecognized Tax Benefit
Reconciliation of Unrecognized Tax Benefits [Line Items]
Beginning Balance	640
Additions for tax positions for prior years	284
Reduction for tax positions for prior years	0
Reduction as a result of a lapse of the applicable statute of limitations	(640)
Ending Balance	284
Interest & Penalties
Reconciliation of Unrecognized Tax Benefits [Line Items]
Beginning Balance	140
Additions for tax positions for prior years	63
Reduction for tax positions for prior years	(25)
Reduction as a result of a lapse of the applicable statute of limitations	(18)
Ending Balance	$ 160