Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 sqft building
Commitments and Contingencies Disclosure [Abstract]
Number of industrial propertiess committed to development	3
Development of industrial buildings in square feet	1,500,000
Estimated construction costs	$ 107,700
Estimated amount remaining to be funded	$ 32,300