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Components of Total Comprehensive Income (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Comprehensive Income (Loss) [Line Items]
Amortization of treasury lock into income, tax	$ 54	$ 54	$ 216

Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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