Restructuring Costs - Summary of Components of Restructuring Charges (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
Non-Cash Items	696	696
Total	2,904	2,904
Employee separation charges [Member]
Restructuring Cost and Reserve [Line Items]
Accruals	2,208	2,208
Non-Cash Items
Total	2,208	2,208
Asset impairments [Member]
Restructuring Cost and Reserve [Line Items]
Accruals
Non-Cash Items	696	696
Total	$ 696	$ 696