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Estimated Fair Value of Options Granted Using Black-Scholes Option-Pricing Model with Weighted-Average Assumptions (Detail)	3 Months Ended
	Mar. 31, 2012 Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	5.55
Interest rate	1.10%
Volatility	51.30%
Dividend yield	0.00%

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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