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Summary of Changes in Stockholders Equity (Parenthetical) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Shareholders Equity [Line Items]
Unrealized loss due to fair value adjustments on interest rate swap agreements, taxes	$ 428	$ 375
Unrealized (loss) gain due to fair value adjustments on available-for-sale securities, taxes	$ 833	$ 2,550
Dividends declared, per share	$ 0.21	$ 0.21

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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