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Summary of Unrealized Losses on Available for Sale Securities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Investment	Dec. 31, 2011
Investments, Unrealized Loss Position [Line Items]
Number of investments in unrealized loss positions	33
Number of investment with unrealized losses	6
Investments that were in unrealized loss position	$ 8,163	$ 0
Unrealized Losses on Investments	$ 270	$ 0

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

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