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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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Proceeds from issuance of common stock net of underwriting discounts and expenses.

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- Definition

Number of new stock issued during the period.

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