Shareholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended	100 Months Ended
	Dec. 19, 2016	Feb. 28, 2017	Feb. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional authorized amount available to repurchase shares	$ 20,000,000
Total amount available to repurchase of shares	21,700,000
Authorized amount under stock repurchase program	$ 40,000,000
Repurchase of common stock		532,692	1,251,203
Repurchase of common stock, average cost per share			$ 14.64
Unrelated to Stock Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock		112