Accounts Receivable - Additional Information (Detail)	3 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Consolidated operating revenues	15.00%	18.00%

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration