Significant Accounting Policies - Cash and Cash Equivalents (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Cash Held by Broker as Margin on Eurodollar Futures Contracts	$ 2,446,000	$ 0
Cash Held on Deposit with Repurchase Agreement Counterparties	0	449,000
Uninsured Cash Balances	7,400,000
Insurance per depositor at each financial institution	$ 250,000

The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

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 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_MarginDepositAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant