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Shareholders' Equity - Additional Information (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares | Dec. 31, 2018 £ / shares | Dec. 31, 2017 £ / shares | Jun. 30, 2015 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |
Deferred shares, multiple of amount paid up on ordinary shares | 100 |  |  |  |  |
Share buy-back program, authorized amount | $ |  |  |  |  |  | $ 10,000,000
Share buy-back program, number of shares authorized |  |  |  |  |  | 2,700,000
Number of ordinary shares repurchased (in shares) | 0 | 0 |  |  |  |
Number of treasury shares held (in shares) | 378,201 | 527,616 |  |  |  |
Cost of treasury shares held | $ | $ 4,300,000 | $ 5,800,000 |  |  |  |
Own shares held by ESOP |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of ordinary shares repurchased (in shares) |  |  | 100,000 |  |  |
Ordinary shares |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares |  |  |  | £ 0.50 | £ 0.50 |
ESOP shares held by trustees | 1,621,301 | 104,709 |  |  |  |
Common stock, shares, outstanding, actively traded | 28,376,729 | 25,929,312 |  |  |  |
Deferred shares |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares |  |  |  | £ 0.0001 | £ 0.0001 |

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