Fair Value Measurements - Additional Information (Detail) (USD $)	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Gains or losses resulting from fair value measurement of financial assets included in earnings	$ 0us-gaap_UnrealizedGainLossOnInvestments	$ 0us-gaap_UnrealizedGainLossOnInvestments

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Name:	us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration