Equity Compensation Plans (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Shares
Outstanding at March 31, 2014	712
Exercisable at March 31, 2014	446
Expected to Vest at March 31, 2014	254
Weighted-Average Exercise Price
Outstanding at March 31, 2014	$ 10.37
Exercisable at September 30, 2013	$ 9.00
Expected to Vest at September 30, 2013	$ 12.68
Weighted- Average Remaining Contractual Term (years)
Outstanding at March 31, 2014	6 years 2 months 12 days
Exercisable at March 31, 2014	4 years 9 months 18 days
Expected to Vest at March 31, 2014	8 years 6 months
Aggregate Intrinsic Value
Outstanding at March 31, 2014	$ 8,901
Exercisable at March 31, 2014	6,186
Expected to Vest at March 31, 2014	$ 2,590