Restructuring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014 employee	Mar. 31, 2014 employee	Feb. 28, 2014 employee	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges recovery	$ 164	$ (1,166)
Restructuring reserve, current	83					1,886
Restructuring reserve, noncurrent	$ 62
2013 Initiatives
Restructuring Cost and Reserve [Line Items]
Reduction in number of employees after restructuring			5	21	41