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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant Accounting Policies [Line Items]
Prior period reclassification adjustment		$ 2.7	$ 2.7
Bad debt expenses	$ 0.2
REIT taxable income distributed to stockholders	100.00%
Minimum
Significant Accounting Policies [Line Items]
Minimum REIT taxable income distributed to stockholders	90.00%

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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