Equity - Additional Information - Stock Issuance - Sabre Shares (Detail) (Sabre Acquisition [Member])	0 Months Ended	9 Months Ended
Aug. 19, 2013	Sep. 30, 2014
Sabre Acquisition [Member]
Shares of common stock issued in consideration of assets purchased	87,928	87,928

Number of shares of equity interests issued or issuable to acquire entity.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)(4)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration