Geographic Information - Geographical Information Attributable to Net Sales (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Revenues From External Customers And Long Lived Assets [Line Items] | |||||||||||
| Net sales | $ 26,300 | $ 28,400 | $ 27,100 | $ 27,100 | $ 25,700 | $ 26,500 | $ 28,900 | $ 27,900 | $ 108,920 | $ 108,994 | $ 103,846 |
| Point of destination | |||||||||||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||||||||||
| Net sales | 108,920 | 108,994 | 103,846 | ||||||||
| United States | Point of destination | |||||||||||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||||||||||
| Net sales | 98,526 | 103,737 | 98,994 | ||||||||
| Canada | Point of destination | |||||||||||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||||||||||
| Net sales | 7,515 | 2,352 | 1,927 | ||||||||
| Other | Point of destination | |||||||||||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||||||||||
| Net sales | $ 2,879 | $ 2,905 | $ 2,925 | ||||||||