Equity - Additional Information (Detail) - Underwritten Public Offering [Member] - USD ($) $ / shares in Units, $ in Millions	Jul. 05, 2016	Jun. 28, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Shares Issued		2,500,000
Stock price, per share		$ 52.50
Proceeds from initial public offering	$ 123.8

Number of new stock issued during the period.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration