Organization - Additional Information (Detail)	Sep. 30, 2014 State ServiceProvider
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of service providers operated	348
Number of states in which Company operates	29

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant