Real Estate and Lending Activities - 2013 Activity - Additional Information (Detail) (2013 Activity [Member], Kansas [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended
Jul. 11, 2013 Facility RenewalOptions	Jun. 30, 2014
2013 Activity [Member] \| Kansas [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired	2
Acquisition costs	$ 75
Term of lease, years		10 years
Number of lease extension options in current lease contract	2
Term of lease extension, years		10 years
Percentage of rental rate	2.00%

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-10.(c)(7)(ii))

-URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 3(ii)(A)

-Article 4

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