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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to opening retained earnings, net of tax				$ 2,888
Contract liability revenue recognized			$ 600	6,900
Transaction price allocated to uncompleted contracts	$ 83,800		$ 83,800	$ 83,800
Expected time of revenue recognition	Over the next 18 months
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to opening retained earnings, net of tax		$ 2,900

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
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+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
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- Definition

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
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