Restructuring - Additional Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) employee	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 1,535,000	$ 0	$ 8,332,000
Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Number of terminations during period | employee				964
Number of positions eliminated, percent				15.50%
Restructuring charges		3,763,000	0	$ 13,505,000	$ 16,100,000
Restructuring charges, net of tax					$ 10,300,000
Employee Severance and Lease Termination | Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 1,500,000	$ 0	$ 8,300,000