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Acquisitions and Divestitures - Acquisition-Related Costs (Detail) (General and Administrative Expense, 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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General and Administrative Expense
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| Business Acquisition [Line Items] | |||
| Business Combination, Acquisition Related Costs | $ 4,363 | $ 6,729 | $ 4,135 |