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Pro Forma Results Under Acquisition (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 ZTEC Instruments, Inc. | Dec. 31, 2012 ZTEC Instruments, Inc. | Dec. 31, 2011 Litepoint Corporation
Business Acquisition, Pro Forma Information [Line Items] |  |  |
Revenue | $ 1,431,270 | $ 1,660,758 | $ 1,527,044
Income from continuing operations |  |  | 357,060
Net income | $ 163,394 | $ 215,654 | $ 382,976
Income from continuing operations per common share, basic |  |  | $ 1.93
Income from continuing operations per common share, diluted |  |  | $ 1.56
Net income per common share, basic | $ 0.86 | $ 1.15 | $ 2.07
Net income per common share, diluted | $ 0.69 | $ 0.94 | $ 1.67

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