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Restructuring Charges - Roll-Forward of Accrued Restructuring Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2013
Restructuring Reserve Disclosures [Line Items]
Restructuring charge	$ (5)	$ 539	$ 534
Severance [Member]
Restructuring Reserve Disclosures [Line Items]
Accrued at January 1, 2013
Restructuring charge		437	437
Payments			(432)
Adjustment of restructuring charge			(5)
Accrued at September 30, 2013