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Stock Repurchases - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 02, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total number of shares repurchased | 0 | 0 |  |
Stock repurchases |  |  | $ 50,021,000 |
August 2012 Stock Repurchase Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchases program, authorized amount |  |  |  | $ 50,000,000.0
2016 and 2014 Share Repurchase Programs |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 54,900,000 |  |  |

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