Other Assets - Summary of Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Restricted cash and cash equivalents	$ 1,003	$ 1,255
Pension asset	1,898	2,593
Other	1,210	995
Total	$ 4,111	$ 4,843