The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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Carrying amount of mortgage loans to individuals not classified as held for investment but are held-for-sale.

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- Definition

The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Mutual Fund [Member]	Mar. 31, 2012 Mutual Fund [Member]	Mar. 31, 2013 Level 2 [Member]	Dec. 31, 2012 Level 2 [Member]	Mar. 31, 2013 Under Commitment To Sell [Member] Level 2 [Member]	Dec. 31, 2012 Under Commitment To Sell [Member] Level 2 [Member]	Mar. 31, 2013 Not Under Commitment To Sell [Member] Level 2 [Member]	Dec. 31, 2012 Not Under Commitment To Sell [Member] Level 2 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Marketable Securities, Unrealized Gain (Loss)			$ 7,400,000	$ 4,800,000
Mortgage loans held-for-sale					86,429,000	119,953,000	64,900,000	108,300,000	21,600,000	11,700,000
Fair value of related party assets	12,900,000	12,900,000
Carrying value of related party assets	5,800,000	5,800,000
Inventory impairments	$ 0	$ 0
Short-term maturities	30 days