The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee bonuses, and which is more likely than not to be realized if sufficient taxable income is generated in future periods to enable the deduction to be taken.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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- Definition

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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Income Taxes - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Feb. 28, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Federal net operating loss carryforward		$ 31,200,000
Estimated tax deferral		127,000,000
proceeds from refund of overpaid federal tax	80,900,000
Reversal of previously recorded liabilities for uncertain tax positions				2,300,000
Uncertain tax benefits that, if recognized, would affect effective tax rate		1,200,000	1,300,000
Recognized interest and penalties related to unrecognized tax benefits		41,000	35,000	276,000
Accrued interest and penalties		$ 374,000	$ 332,000
Minimum
Income Taxes [Line Items]
Net operating loss carryforward, expiration date		2030
Maximum
Income Taxes [Line Items]
Net operating loss carryforward, expiration date		2031