Related Parties - Additional Information (Detail)	9 Months Ended
Sep. 30, 2015
Related Party Transactions [Abstract]
Lease termination date	Oct. 31, 2015

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

No definition available.

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration