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Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Other Current Assets, Properties and Equipment, Other Assets Accrued Expenses Other Current Liabilities and other Non current liabilities and Deferred Credits [Abstract]
Deposits		$ 1,403	$ 1,780
Investments held in rabbi trust	[1]	38	8,908
Prepaid expenses		8,439	8,442
Total other current assets		$ 9,880	$ 19,130
[1] The company converted substantially all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment.

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