Estimate of Fair Value of Secured Debt Obligations (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014 TriplePoint - May 2014 Advance Principal Balance	Jun. 30, 2014 TriplePoint - May 2014 Advance Estimated Fair Value	Dec. 31, 2013 TriplePoint - September 2010 Advance Principal Balance	Dec. 31, 2013 TriplePoint - September 2010 Advance Estimated Fair Value	Dec. 31, 2013 TriplePoint - October 2011 Advance Principal Balance	Dec. 31, 2013 TriplePoint - October 2011 Advance Estimated Fair Value	Dec. 31, 2013 TriplePoint - January 2012 Advance Principal Balance	Dec. 31, 2013 TriplePoint - January 2012 Advance Estimated Fair Value
Accounts Notes And Loans Receivable [Line Items]
Debt instrument fair value	$ 970	$ 902	$ 917	$ 847	$ 6,657	$ 5,942	$ 3,495	$ 3,079

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant