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Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Interest paid | $ 2,802 | $ 1,854 | $ 1,348
Income taxes net of refunds | 46,819 | 45,137 | 37,361
Carrier Enterprise III |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Common stock issued for Carrier Enterprise III | 93,250 |  |
Carrier Enterprise II |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Net assets of locations contributed to Carrier Enterprise II |  | $ 14,769 |

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