Special Charges - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) Employee	Dec. 31, 2015 USD ($)
Other Income And Expenses [Abstract]
Special charges	$ 1,750	$ 6,811
Number of employees terminated for future growth | Employee		19
Special charges liability	$ 14,102	$ 14,102	$ 11,813
Total expected payments to special charges, amount expected to be paid in 2016		4,500
Total expected payments to special charges, amount expected to be paid in 2017		4,100
Total expected payments to special charges, amount expected to be paid in 2018		2,600
Total expected payments to special charges, amount expected to be paid in 2019		1,200
Total expected payments to special charges, amount expected to be paid from 2020 to 2026		$ 1,700