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Disclosure of Supplemental Cash Flow Information (Detail) - Disclosure of Supplemental Cash Flow Information (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Interest paid | $ 7,295 | $ 5,081 | $ 1,672
Income taxes paid (refunded) | 6,940 | 9,159 | (36,355)
Fair value of CTI assets acquired |  | 217,015 |
Fair value of CTI liabilities acquired |  | 57,159 |
Cash paid |  | 159,856 |
Less: Cash acquired |  | 11,097 |
Net cash paid for CTI acquisition |  | $ 148,759 |

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