2013 Restructuring - Amount Expected to be Incurred and Amount Incurred by Expense Type (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Total Estimated Expense	$ 561
Incurred	46	515
Severance Expense [Member]
Restructuring Cost and Reserve [Line Items]
Total Estimated Expense	419
Incurred		419
Other Expense [Member]
Restructuring Cost and Reserve [Line Items]
Total Estimated Expense	142
Incurred	$ 46	$ 96