Changes in Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $)	3 Months Ended
Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassifications	$ 0	$ 0

Amount before tax of reclassification adjustments of other comprehensive income (loss).

No definition available.

Name:	us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration