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Disclosure of Supplemental Cash Flow Information (Detail) - Disclosure of Supplemental Cash Flow Information (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Interest paid |  | $ 5,622 | $ 3,089
Income taxes paid |  | 6,170 | 8,852
Fair value of CTI assets acquired |  |  | 215,817
Fair value of CTI liabilities acquired |  |  | 55,961
Cash paid |  |  | 159,856
Less: Cash acquired |  |  | 11,097
Net cash paid for CTI acquisition | $ 148,800 |  | $ 148,759

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