Business Description - Additional Information (Detail)	Jun. 30, 2018 USD ($)
Accounting Standards Update 2014-09 \| Retained Earnings
Description of Business [Line Items]
Cumulative adjustment to retained earnings	$ 773,000

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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