Restructuring - Summary of Restructuring Liability (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Balance at December 31, 2012	$ 0
Accruals	3,728,000
Payments	(2,847,000)
Balance at December 31, 2013	881,000
Employee Severance Costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance at December 31, 2012	0
Accruals	2,273,000
Payments	(2,273,000)
Balance at December 31, 2013	0
Other Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance at December 31, 2012	0
Accruals	1,455,000
Payments	(574,000)
Balance at December 31, 2013	$ 881,000