Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended
Sep. 30, 2013
Schedule Of Earnings Per Share [Line Items]
Repurchasing amount	$ 37,209
Common Class A [Member]
Schedule Of Earnings Per Share [Line Items]
Repurchased Shares	13,219
Repurchasing amount	$ 37,209
Common Class B [Member]
Schedule Of Earnings Per Share [Line Items]
Repurchased Shares	0
Common Class C [Member]
Schedule Of Earnings Per Share [Line Items]
Repurchased Shares	0

Number of shares that have been repurchased during the period and are being held in treasury.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration