Subsequent Events - Additional Information (Detail) (Subsequent Events [Member], USD $)	1 Months Ended
Sep. 01, 2013	Jul. 01, 2013	Jul. 08, 2013
Subsequent Events [Member]
Subsequent Event [Line Items]
Principal payments			$ 15,000,000
Restricted cash used to pay principal amount	12,100,000	2,900,000
Restricted cash used to pay interest amount	$ 2,900,000	$ 30,000

Amount of the required periodic payments applied to principal.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration