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Revenue Recognition - Schedule of Estimated Amount of Deferred Revenue and Customer Advances (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
Revenue Recognition [Line Items]
Deferred revenue and customer advances expected to be recognized	$ 240,755
In One Year or Less [Member]
Revenue Recognition [Line Items]
Deferred revenue and customer advances expected to be recognized	203,715
In 13-24 Months [Member]
Revenue Recognition [Line Items]
Deferred revenue and customer advances expected to be recognized	24,522
In 25 Months and Beyond [Member]
Revenue Recognition [Line Items]
Deferred revenue and customer advances expected to be recognized	$ 12,518

X

- 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)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

+ Details

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X

- Definition

Revenue recognition.

+ References

No definition available.

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