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Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Other Current Assets, Properties and Equipment, Other Assets Accrued Expenses Other Current Liabilities and other Non current liabilities and Deferred Credits [Abstract] |  |  |
Deposits |  | $ 2,151 | $ 1,780
Investments held in rabbi trust | [1] | 45 | 8,908
Prepaid expenses |  | 8,017 | 8,442
Total other current assets |  | $ 10,213 | $ 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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