Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands |
Sep. 30, 2016 |
Jun. 30, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|---|---|---|---|
| Inventory Disclosure [Abstract] | ||||||
| Finished goods | $ 16,139 | $ 18,427 | ||||
| Semi-finished goods and work-in-process | 55,744 | 47,131 | ||||
| Raw materials | 6,821 | 5,987 | ||||
| Materials in-transit | 1,842 | 2,107 | ||||
| Less: inventory reserve | (8,490) | $ (14,997) | (16,033) | $ (21,640) | $ (31,361) | $ (47,488) |
| Inventories, net | $ 72,056 | $ 57,619 |