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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Loss Carryforwards [Line Items] |  |  |
Excess tax benefit (shortfall) from exercise of stock options | $ (292,000) | $ 1,822,000 | $ 1,329,000
Undistributed earnings of foreign subsidiaries | $ 1,900,000 | 1,600,000 |
Likelihood percentage of being realized upon ultimate settlement with the relevant tax authority | 50.00% |  |
Unrecognized tax benefits | $ 0 | 0 |
Changes in unrecognized benefits | 0 | $ 0 | $ 0
Foreign [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Company's foreign net operating losses for tax purposes | $ 1,800,000 |  |
Foreign net operating loss carry forwards, expiration date | 2023 |  |

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