Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Name:	us-gaap_TreasuryStockShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Basis of Presentation (Detail) - USD ($)	3 Months Ended	9 Months Ended
Basis of Presentation (Detail) - USD ($)	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2015	Jun. 16, 2015	Dec. 31, 2014
Basis of Presentation
Decrease in cost of sales		$ 206,000
Increase in selling, general and administrative expenses	$ 69,000
Authorized repurchase amount				$ 10,000,000
Number of shares repurchased			29,559		0