Restructuring - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) employee	Dec. 31, 2014 USD ($) employee	Dec. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	$ 11,239	$ 13,672	$ 0
Restructuring liabilities	6,636	6,056	$ 0
2015 Initiative
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	$ 11,239
Number of employees | employee	208
2014 Initiative
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative		$ 13,672
Number of employees | employee		217