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Segment Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Revenue, Major Customer [Line Items] |  |  |
Revenues from foreign operations | $ 299.2 | $ 249.8 |
Property and equipment held in foreign countries | $ 156.5 |  | $ 151.9
Canada [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total revenue which were earned in Canada | 96.00% | 96.00% |

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