Soft Dollar Arrangements - Additional Information (Detail)

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Soft Dollar Arrangements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Soft Dollar Arrangements [Abstract]
Soft dollar credits	$ 248	$ 223	$ 744	$ 669