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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2010	Sep. 30, 2014
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill acquired on acquisition	$ 63,423,000us-gaap_Goodwill	$ 64,493,000us-gaap_Goodwill
Credo [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill acquired on acquisition	59,549,000	60,619,000
Water Resources Company [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill acquired on acquisition		3,874,000
Water Resources Company [Member] \| Groundwater Leases [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Identified intangible assets			1,681,000
Patents [Member] \| Credo [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Identified intangibles, net	378,000
Multi Family Property [Member] \| Austin, Texas [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Identified intangibles, net	$ 649,000			$ 865,000