Summary of Restricted Stock Award Activity (Detail) - Restricted Stock Awards (RSAs) [Member] - $ / shares	1 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Grants outstanding at beginning of the period		161,320		6,000	6,000
Shares, Granted	65,000	117,553	[1]	181,783	0
Shares, Vested		(59,703)		(24,463)	0
Shares, Forfeited		(66,000)	[2]	(2,000)
Shares, Grants outstanding at end of the period		153,170		161,320	6,000
Weighted Average Grant Date Fair Value per Share, Grants outstanding at beginning of the period		$ 21.50		$ 34.92	$ 34.92
Weighted Average Grant Date Fair Value per Share, Granted		41.22		20.80	0
Weighted Average Grant Date Fair Value per Share, Vested		13.62		20.21	0
Weighted Average Grant Date Fair Value per Share, Forfeited		33.51		13.90	0
Weighted Average Grant Date Fair Value per Share, Grants outstanding at end of the period		$ 34.53		$ 21.50	$ 34.92

[1] In September 2016, the Company granted executives RSAs with certain sales targets. If the sales targets are achieved within the required time frame, the number of RSAs may be increased from 71,925 to 89,906 shares. If and when deemed probable that such performance milestones may be achieved within the required time frame, the Company may recognize up to $4.4 million of stock-based compensation related to these grants.

[2] In September 2015, the Company granted executives 65,000 RSAs with performance conditions. As a result of the performance conditions not being met, these grants were cancelled during 2016.