Long-term Debt - Schedule of Maturities of Long Term Debt (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2014
March 31, 2015-March 31, 2016 [Member]
Debt Instrument [Line Items]
Principal payment date	2015-03-31 - 2016-03-31
June 30, 2016- March 31, 2017 [Member]
Debt Instrument [Line Items]
Principal payment date	2016-06-30 - 2017-03-31
June 30, 2017-December 31, 2018 [Member]
Debt Instrument [Line Items]
Principal payment date	2017-06-30 - 2018-12-31

Description of the frequency of periodic payments (monthly, quarterly, annual).

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 210.5-02.22)

-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 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Name:	us-gaap_DebtInstrumentFrequencyOfPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration