Long-Term Stock Incentive Plan - Narrative (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended		1 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2011 Year	Dec. 31, 2010 Year	Jun. 27, 2011 Equity Incentive Plan 2010 [Member]	Dec. 31, 2011 Equity Incentive Plan 2010 [Member]	Dec. 31, 2011 The Prior Plan [Member] Minimum [Member]	Dec. 31, 2011 The Prior Plan [Member] Maximum [Member]	Dec. 31, 2011 Stock Options [Member] Year	Dec. 31, 2011 Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term stock compensation - ceiling shares				25,000,000	500,000	8,932,921
Long-term stock compensation - shares granted	7,500	8,750	1,250					402,000
Long-term stock compensation - granting of options authorized, percent of diluted outstanding common stock					9.50%
Long-term stock compensation - vesting period							4 years	4 years
Long-term stock compensation - vesting installments							4
Long-term stock compensation - minimum contractual term							5 years
Long-term stock compensation - maximum contractual term			5 years				10 years
Long-term stock compensation - vesting period			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.				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.
Weighted average remaining contractual term of stock options outstanding, years	5.5	6.6
Weighted average remaining contractual term of stock options exercisable, years	4.8	5.6
Total unrecognized compensation cost related to nonvested share-based compensation awards	$ 4.2	$ 8.8
Total unrecognized compensation cost related to nonvested share-based compensation awards weighted average recognition period, years	1.1	2.0