Stock-based Compensation - Additional Information (Detail) (USD $)	3 Months Ended			1 Months Ended	3 Months Ended									12 Months Ended		3 Months Ended			12 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Minimum [Member]	Sep. 30, 2000 Maximum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2013 Fiscal 2011 - 2013 [Member]	Dec. 31, 2013 Fiscal 2012 - 2014 [Member]	Dec. 31, 2013 Fiscal 2013 - 2015 [Member]	Dec. 31, 2013 Fiscal 2014 - 2016 [Member]	Dec. 31, 2013 Nonqualified Stock Options [Member] Minimum [Member]	Dec. 31, 2013 Nonqualified Stock Options [Member] Maximum [Member]	Dec. 31, 2013 Performance Shares [Member]	Sep. 30, 2013 Performance Shares [Member]	Sep. 30, 2012 Performance Shares [Member]	Dec. 31, 2013 Performance Shares [Member] Maximum [Member]	Dec. 31, 2013 Performance Shares [Member] Scenario, Forecast [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Scenario, Forecast [Member]
Stock Based Compensation Activity [Line Items]
Unrecognized compensation costs related to non-vested awards	$ 5,100,000
Weighted average period for recognition of compensation costs related to non-vested awards	2 years 4 months 24 days
Performance Share Awards Fully Expensed	1,600,000
Weighted average per share fair value of stock options	$ 8.80	$ 8.48
Dividend yield	0.00%	0.00%
Percentage of non qualified stock options on each of first five anniversaries	20.00%
Percentage of non qualified stock options on each of first four anniversaries	25.00%
Stock option expiration term upon expiration of employment or service											7 years	10 years
Total pre-tax intrinsic value of options exercised	500,000					100,000
Restricted stock expense	100,000	100,000
Performance period start year							2011	2012	2013	2014
Performance period end year							2013	2014	2015	2016
Performance Shares, time period	3 years
Performance share awards, estimated vesting percentage			20.00%		200.00%
Issuance of shares													122,053			137,066
Expense recognized related to Performance Shares	300,000	200,000
Fair value of performance shares for grants awarded														900,000	800,000		900,000
Common stock authorized, shares				400,000
Annual compensation withheld				10.00%
Annual compensation withheld, maximum limit				25,000
Employee contributions	100,000					100,000
Stock compensation expenses recognized					100,000	100,000
Number of restricted stock units awarded																		7,821	22,400	22,400
Number of restricted stock issued value																		184,000
RSU award vest each year																		33.00%
RSU expenses	$ 100,000					$ 100,000