Restructuring Costs - Additional Information (Detail)		3 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($) Employees	Mar. 31, 2014 Employees	Dec. 31, 2015 USD ($) Employees	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Consolidated charge to earnings			$ 236,000	$ 463,000
Restructuring reserve					$ 0
Restructuring Plan 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Consolidated charge to earnings	$ 236,000		$ 236,000
The total number of employees affected by the restructuring plan | Employees	41
Number of employees terminated by the restructuring plan | Employees	41		41
Restructuring reserve	$ 0		$ 0	0
Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Consolidated charge to earnings				$ 463,000
The total number of employees affected by the restructuring plan | Employees		11
Number of employees terminated by the restructuring plan | Employees		11