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Loan Transactions and Related Notes Receivable - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Jan. 31, 2009 First Credit Agreement	Jan. 31, 2009 Second Credit Agreement	Jul. 31, 2014 Third Credit Agreement	Dec. 31, 2009 Third Credit Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan amount	$ 10,000	$ 10,000	$ 7,400	$ 10,000
Notes receivable, maturity			Aug. 30, 2015

X

- Definition

Notes Receivable, Maturity Date

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

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