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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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Amount of cash paid to acquire the entity.

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