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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 2 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 22, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 21, 2017
Class Of Stock [Line Items] |  |  |  |  |
Number of shares repurchased |  |  | 5,000 | 294,000 |
Shares repurchased aggregate purchase price |  | $ 112,699 | $ 645 | $ 22,817 |
Subsequent Event |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Number of shares repurchased | 42,000 |  |  |  |
Shares repurchased aggregate purchase price | $ 6,200 |  |  |  |
Number of shares authorized to be repurchased |  |  |  |  | 2,000,000

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