Long-Term Stock Incentive Plans - Narrative (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Restricted Stock [Member]	Jun. 30, 2011 Restricted Stock [Member]	Jun. 27, 2011 Equity Incentive Plan 2010 [Member]	May 27, 2010 Equity Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term stock compensation - ceiling shares	8,932,921					25,000,000
Long-term stock compensation - shares granted	7,500	7,500	324,674	328,550	1,250
Long-term stock compensation - vesting - years	P4Y
Long-term stock compensation - granting of options authorized, minimum shares	500,000
Long-term stock compensation - granting of options authorized, minimum percent of diluted outstanding common stock	9.50%
Long-term stock compensation - vesting period	Stock options were issued at the market price on the date of grant, subject to an immediate or four year vesting in four equal installments with a contractual term of 5 or 10 years.				The stock options were issued at the current market price on the date of grant and immediately vested with a contractual term of 5 years.
Long-term stock compensation - vesting installments	4
Long-term stock compensation - contractual term minimum years	P5Y
Long-term stock compensation - contractual terms maximum years	P10Y				P5Y
Weighted average remaining contractual term of stock options outstanding, years	6.0	7.1
Weighted average remaining contractual term of stock options exercisable, years	5.3	6.0
Total unrecognized compensation cost related to nonvested share-based compensation awards	$ 6.4	$ 11.2
Total unrecognized compensation cost related to nonvested share-based compensation awards weighted average recognition period, years	1.6	2.5