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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Sep. 30, 2018	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment as an increase to opening retained earnings, net of tax				$ 2,142
Contract liability revenue recognized				7,000
Transaction price allocated to uncompleted contracts	$ 88,000			$ 88,000
Expected time of revenue recognition	Over the next 18 months.
Performance obligation, description of timing				One year or less.
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment as an increase to opening retained earnings, net of tax		$ 2,100	$ (800)
Increase (decrease) in current assets		2,800	(1,000)
Increase (decrease) in deferred income taxes		$ 700	$ (200)

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Increase Decrease In Current Assets

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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