Other Long-Term Assets - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Other Long Term Assets [Line Items]
Other long-term assets, related to certain software and maintenance contracts	$ 4,549	$ 6,110
Other Long-Term Assets
Schedule of Other Long Term Assets [Line Items]
Deferred debt-issuance costs	1,000	1,900
Other long-term assets, related to certain software and maintenance contracts	1,600	2,300
Deferred tax asset	1,000	800
Lease Receivables
Schedule of Other Long Term Assets [Line Items]
Other long-term assets, related to certain software and maintenance contracts	700	$ 1,100
Derivative Assets
Schedule of Other Long Term Assets [Line Items]
Other long-term assets, related to certain software and maintenance contracts	$ 200