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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |
Proceeds from common stock issuance | $ 270,700 | $ 13,865 | $ 2,390 | $ 276,992
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock issued | 8,000 |  |  | 7,986
Common stock, offering price | $ 36.00 |  |  |

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