Fair Value of Financial Instruments - Summary of Fair Value Maturities for Financial Asset (Detail) $ in Thousands	Sep. 30, 2016 USD ($)
Fair Value Disclosures [Abstract]
Maturities, Total	$ 65,125
Maturities, Less than 1 year	53,283
Maturities, 1-5 years	$ 11,842

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant