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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Jan. 01, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative-effect adjustment directly to retained earnings				$ 1,496
ASU 2016-16 | Scenario, Forecast
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative-effect adjustment directly to retained earnings		$ 27,771
ASU 2016-09
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative-effect adjustment directly to retained earnings	$ 1,496		$ 1,496
ASU 2014-09 | Scenario, Forecast
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative-effect adjustment directly to retained earnings		$ 3,600

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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+ References

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