Restructuring Costs - Schedule of Restructuring Liability (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]
Accruals	$ 2,208	$ 2,208
Accrued Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance
Accruals		2,208
Payments		(1,611)
Ending balance	$ 597	$ 597