Exit and Disposal Activities - Additional Information (Details)	1 Months Ended	3 Months Ended
	Dec. 31, 2017 USD ($) Employee	Dec. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items]
Expected annualized cash savings	$ 6,000,000
Termination costs		$ 700,000
Expected further termination costs	0	0
Outstanding liabilities	$ 0	$ 0
Employee Reduction | Houston Area Workforce
Restructuring Cost And Reserve [Line Items]
Reduction in number of employees | Employee	60