Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other Assets, Noncurrent [Abstract]
Recoverable insurance losses	$ 5,088	$ 4,056
Investments held for supplemental savings plan accounts	5,035	4,807
Long-term deposits	18,594	16,848
Deferred tax asset	395	395
Right of use asset	4,651
Other	5,888	5,220
Total other assets	$ 39,651	$ 31,326