Debt - Summary of Amendment to Senior Secured Revolving Credit Facility (Parenthetical) (Details) (USD $)	6 Months Ended
Jun. 30, 2013
Senior Secured Notes [Line Items]
Additional credit facility	$ 20,000,000
Minimum
Senior Secured Notes [Line Items]
Line of credit, interest spread basis points	2.00%
Line of credit facility commitment fee, basis points	0.25%
Maximum
Senior Secured Notes [Line Items]
Line of credit, interest spread basis points	3.00%
Line of credit facility commitment fee, basis points	0.35%

Increase for additional borrowings on the credit facility during the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Name:	us-gaap_LineOfCreditFacilityIncreaseAdditionalBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration