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Interim Financial Statements - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) Segment ManufacturingPlants | Jun. 30, 2015 USD ($)
Interim Reporting [Line Items] |  |  |  |
Number of manufacturing plants | ManufacturingPlants |  |  | 41 |
Number of reportable segments | Segment |  |  | 3 |
Share based compensation expense |  |  | $ 2,485 | $ 1,771
Selling, General and Administrative Expense [Member] |  |  |  |
Interim Reporting [Line Items] |  |  |  |
Share based compensation expense | $ 1,500 | $ 1,000 | $ 2,500 | $ 1,800
Selling, General and Administrative Expense [Member] | Executive Officer [Member] |  |  |  |
Interim Reporting [Line Items] |  |  |  |
Share based compensation expense | $ 400 |  |  |

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