Shareholders' Equity - Additional Information (Detail) - USD ($)		3 Months Ended	6 Months Ended
	Mar. 29, 2017	Jun. 20, 2017	Jun. 20, 2017	Aug. 23, 2016	Feb. 26, 2016
Common Stock and Warrants [Member]
Class of Stock [Line Items]
Maximum authorized stock repurchase amount (up to)		$ 50,000,000	$ 50,000,000	$ 25,000,000	$ 25,000,000.0
Remaining authorized stock repurchase amount		$ 25,300,000	$ 25,300,000
Common Stock [Member]
Class of Stock [Line Items]
Shares repurchased (in shares)			641,165
Average price per share			$ 12.48
Shares repurchased, value			$ 8,000,000
Warrants [Member]
Class of Stock [Line Items]
Shares repurchased (in shares)	400,000	400,000	400,000
Average price per share	$ 3.75	$ 3.75	$ 3.75
Shares repurchased, value		$ 1,500,000	$ 1,500,000
Discount on repurchase	5.00%
Share Price	$ 3.95