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Investments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018
ASU 2016-01 [Member]
Schedule Of Investments [Line Items]
Reclassification of net unrealized gains of marketable equity securities from AOCI to retained earnings		$ 3.2
Investment [Member] | Issuer Concentration [Member] | Market Value of Total Investment Portfolio [Member]
Schedule Of Investments [Line Items]
Investment concentration risk percentage	5.00%

X

- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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