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Investments in Unconsolidated Affiliates - Additional Information (Detail) (USD $)
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3 Months Ended |
12 Months Ended |
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Dec. 31, 2014
JointVenture
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
JointVenture
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Dec. 31, 2013
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Dec. 31, 2012
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| Schedule of Equity Method Investments [Line Items] |
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| Number of strategic joint ventures |
2 |
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2 |
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| Investments in unconsolidated affiliates |
$ 167,658,000 |
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$ 155,887,000 |
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$ 167,658,000 |
$ 155,887,000 |
$ 140,304,000 |
| Dividends received from investing activities |
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978,000 |
1,055,000 |
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| Equity in earnings of unconsolidated affiliates |
18,154,000 |
9,267,000 |
5,378,000 |
14,950,000 |
12,195,000 |
15,215,000 |
8,929,000 |
2,799,000 |
47,749,000 |
39,138,000 |
27,140,000 |
| Sales to unconsolidated affiliates |
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6,500,000 |
8,200,000 |
9,500,000 |
| Purchases from unconsolidated affiliates |
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290,300,000 |
274,400,000 |
269,100,000 |
| Accounts receivable due from unconsolidated affiliates |
2,000,000 |
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3,300,000 |
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2,000,000 |
3,300,000 |
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| Accounts payable due to unconsolidated affiliates |
28,600,000 |
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29,900,000 |
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28,600,000 |
29,900,000 |
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| AmSty [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Investments in unconsolidated affiliates |
133,500,000 |
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118,300,000 |
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133,500,000 |
118,300,000 |
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| Investment in unconsolidated affiliates-difference between carrying amount and underlying equity |
108,400,000 |
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130,800,000 |
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108,400,000 |
130,800,000 |
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| Percentage of ownership underlying net assets |
50.00% |
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50.00% |
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| Amortized weighted average remaining useful life |
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5.7 years |
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| Dividends received from operating activities |
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35,000,000 |
22,500,000 |
20,000,000 |
| Sumika Styron [Member] |
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| Schedule of Equity Method Investments [Line Items] |
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| Investments in unconsolidated affiliates |
34,100,000 |
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37,600,000 |
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34,100,000 |
37,600,000 |
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| Investment in unconsolidated affiliates-difference between carrying amount and underlying equity |
21,300,000 |
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20,800,000 |
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21,300,000 |
20,800,000 |
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| Percentage of ownership underlying net assets |
50.00% |
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50.00% |
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| Amortized weighted average remaining useful life |
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10.8 years |
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| Dividends received from operating activities |
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1,000,000 |
| Dividends received from investing activities |
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$ 1,000,000 |
$ 1,100,000 |
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