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Auction Rate Securities - ARS Investments (Parenthetical) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015
Investments Debt And Equity Securities [Abstract]
Investment securities accretion	$ 3.1	$ 2.7

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- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

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- References

No definition available.

+ Details

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