Stock Benefit Plans (Detail) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Number of Equity Incentive Plans (in plans)	2
Employee Stock [Member] | Restricted Stock [Member]
Non-Option Equity Instruments, Granted (in shares)	15,000
Director [Member] | Restricted Stock [Member]
Non-Option Equity Instruments, Granted (in shares)	17,320