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Common Stock - Narrative (Detail) - Common Stock - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 01, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |
Sale of shares of common stock (in shares) | 1,500,000 | 1,500,000
Purchase price per share (USD per share) | $ 17.50 |
Proceeds from issuance of common stock net of underwriting discounts and expenses | $ 24.2 |

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