Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross number of share options (or share units) granted during the period.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 13, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Nov. 29, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized to be repurchased							750,000
Stock repurchased during period, shares	300,000	359,959			359,959
Additional shares authorized for purchase	450,000	390,041	390,041		390,041
Stock repurchased during period, value		$ 372
Share-based compensation, amount recognized			$ 0	$ 1	$ 1	$ 6
2011 Director Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted			0	0	0	0
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized to be repurchased							300,000