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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2009 SHI Minimum
Income Taxes [Line Items]
Income tax benefit	$ 848,000	$ (676,000)	$ 96,000	$ (1,017,000)
Deferred tax asset, net	36,900,000		36,900,000
Deferred tax asset valuation	36,900,000		36,900,000
Estimated income tax payment under the Tax Distribution Agreement					61,000,000
Distribution to Partners to fund related payment to IRS					$ 104,000,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.