Segment Reporting - Additional Information (Detail) |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2015
USD ($)
|
Sep. 30, 2015
USD ($)
|
Jun. 30, 2015
USD ($)
|
Mar. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Sep. 30, 2014
USD ($)
|
Jun. 30, 2014
USD ($)
|
Mar. 31, 2014
USD ($)
|
Dec. 31, 2015
USD ($)
Segment
Customer
|
Dec. 31, 2014
USD ($)
Customer
|
Dec. 31, 2013
USD ($)
Customer
|
|
| Segment Reporting Information [Line Items] | |||||||||||
| Number of reporting operating segments | Segment | 4 | ||||||||||
| Foreign sales | $ 663,791,000 | $ 558,022,000 | $ 661,743,000 | $ 1,598,358,000 | $ 1,197,994,000 | $ 897,408,000 | $ 979,661,000 | $ 1,994,699,000 | $ 3,481,914,000 | $ 5,069,762,000 | $ 4,683,349,000 |
| Assets | 1,000,332,000 | $ 1,339,840,000 | 1,000,332,000 | 1,339,840,000 | |||||||
| Canada [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Foreign sales | 207,700,000 | $ 344,300,000 | $ 286,600,000 | ||||||||
| Natural Gas [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Assets | $ 0 | $ 0 | |||||||||
| Net Sales and Adjusted Gross Margin [Member] | Maximum [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Percentage of net sales | 10.00% | ||||||||||
| Sales Revenue, Net [Member] | Maximum [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Percentage of net sales | 10.00% | 10.00% | |||||||||
| Customer Concentration Risk [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Number of customers exceeding threshold | Customer | 0 | 0 | 0 | ||||||||