Non-controlling Interests - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended		1 Months Ended	3 Months Ended
Jun. 01, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Westheimer [Member]	Mar. 29, 2012 Deer Valley Operating Property [Member]	Mar. 31, 2013 Houston, Texas Operating Property [Member]	Jun. 30, 2013 Subsidiary Company [Member]
Noncontrolling Interest [Line Items]
Percentage of non-controlling ownership interest	20.00%			32.00%	3.50%	1.00%	1.00%
Investment in equity investments	$ 5,850,000	$ 11,982,000	$ 47,925,000		$ 400,000	$ 75,000	$ 75,000
Purchase price accounting, carrying value of the acquired non-controlling interest	363,000				192,000	127,000	126,000
Purchase price accounting, adjustments in paid-in capital	$ 5,487,000				$ 208,000	$ 52,000	$ 51,000

Purchase price accounting reduction in paid in capital.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464

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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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