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Results of Operations of Nonconsolidated Affiliates - Schedule of Investment in and Advances to Nonconsolidated Affiliates (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Equity Method Investments And Joint Ventures [Abstract] | |||
| Beginning balance | $ 168,824 | $ 194,299 | |
| Share of income | 32,564 | 23,364 | 16,767 |
| Share of distributions | (53,328) | (53,097) | |
| Acquisitions | 36,021 | 5,126 | |
| Conversion to/from investments in nonconsolidated affiliates | 8,238 | 186 | |
| Sale/closure of investments in nonconsolidated affiliates | (1,947) | (2,133) | |
| Other | 4,238 | 1,079 | |
| Total investment in and advances to nonconsolidated affiliates | $ 194,610 | $ 168,824 | $ 194,299 |