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Preliminary Purchase Price Allocation - Distra (Detail) (USD $) In Thousands, unless otherwise specified |  |  |  | 1 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012 | Sep. 18, 2012 Distra Pty Ltd | Sep. 18, 2012 Distra Pty Ltd Software | Sep. 18, 2012 Distra Pty Ltd Customer relationships
Business Acquisition [Line Items] |  |  |  |  |
Total current assets acquired |  |  | $ 1,857 |  |
Goodwill | 625,990 | 501,141 | 22,139 |  |
Amortizable intangible assets |  |  |  | 18,802 | 6,200
Deferred income taxes |  |  | 4,075 |  |
Other noncurrent assets |  |  | 96 |  |
Total assets acquired |  |  | 53,169 |  |
Current liabilities acquired |  |  | 3,419 |  |
Net assets acquired |  |  | $ 49,750 |  |
Weighted-Average useful lives |  |  |  | 7 years | 10 years

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