Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Litigation settlement charges	$ 15.0

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

No definition available.

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