Share Repurchase Program - Additional Information (Detail) - Share Repurchase Program [Member] - USD ($)	1 Months Ended	3 Months Ended	13 Months Ended
	Jan. 31, 2016	Mar. 31, 2017	Mar. 31, 2017	Oct. 31, 2016
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program authorized	$ 25,000,000
Shares repurchase program period	2 years
Commencement date		Mar. 01, 2016
Shares repurchase program additional authorized amount				$ 50,000,000
Total shares repurchased		65,317	221,185
Cost of common stock shares repurchased		$ 12,200,000
Amount available for repurchase		$ 38,900,000	$ 38,900,000