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Schedule of Stock Options Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Shares
Options exercised	(6,000)	(75,000)
Employee Stock Option [Member]
Shares
Beginning balance	647,240
Options granted	45,000
Options exercised	(6,000)
Options forfeited	0
Ending balance	686,240		647,240
Options exercisable	641,240
Weighted Average Exercise Price
Beginning balance	$ 5.62
Options granted	18.11
Options exercised	4.50
Options forfeited	0
Ending balance	6.45		$ 5.62
Options exercisable	$ 5.27
Weighted Average Remaining Contractual Term (Years)
Options outstanding	3 years 11 months 12 days		4 years 1 month 17 days
Options exercisable	3 years 7 months 20 days
Aggregate Intrinsic Value
Beginning Balance	$ 9.2
Options exercised	0.1
Ending balance	8.1		$ 9.2
Options exercisable	$ 8.1
Allied Pacific of California [Member]
Shares
Beginning balance	853,800
Options granted	0
Options exercised	0
Options forfeited	0
Ending balance	853,800		853,800
Weighted Average Exercise Price
Beginning balance	$ 0.167
Options granted	0
Options exercised	0
Options forfeited	0
Ending balance	$ 0.167		$ 0.167
Weighted Average Remaining Contractual Term (Years)
Options outstanding	6 months		9 months
Aggregate Intrinsic Value
Beginning Balance	$ 0.5
Ending balance	$ 0.5		$ 0.5

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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