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Business Segments (Schedule of Information on Company's Business Segments) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 549,696 | $ 514,881 | $ 1,052,268 | $ 1,017,079 |
Operating income | 112,976 | 109,909 | 215,533 | 211,666 |
Interest expense | 11,205 | 10,584 | 21,694 | 21,181 |
Other (income) expense - net | (1,874) | 827 | (2,618) | (896) |
Income before income taxes | 103,645 | 98,498 | 196,457 | 191,381 |
Total assets | 3,109,356 |  | 3,109,356 |  | $ 2,805,443
Intersegment elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (293) | (758) | (525) | (2,550) |
Corporate office and other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | (16,130) | (15,490) | (31,077) | (34,250) |
Total assets | 126,646 |  | 126,646 |  | 123,008
Fluid & Metering Technologies |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | 221,810 | 215,293 | 433,653 | 433,541 |
Operating income | 53,865 | 51,857 | 105,266 | 107,755 |
Fluid & Metering Technologies | External customers |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | 221,635 | 214,983 | 433,344 | 432,915 |
Total assets | 1,118,917 |  | 1,118,917 |  | 1,125,266
Fluid & Metering Technologies | Intersegment elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | 175 | 310 | 309 | 626 |
Health & Science Technologies |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | 186,568 | 188,405 | 372,911 | 367,525 |
Operating income | 41,125 | 42,060 | 81,824 | 79,517 |
Health & Science Technologies | External customers |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | 186,453 | 188,046 | 372,704 | 365,796 |
Total assets | 1,110,302 |  | 1,110,302 |  | 1,108,302
Health & Science Technologies | Intersegment elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | 115 | 359 | 207 | 1,729 |
Fire & Safety/Diversified Products |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | 141,611 | 111,941 | 246,229 | 218,563 |
Operating income | 34,116 | 31,482 | 59,520 | 58,644 |
Fire & Safety/Diversified Products | External customers |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | 141,608 | 111,852 | 246,220 | 218,368 |
Total assets | 753,491 |  | 753,491 |  | $ 448,867
Fire & Safety/Diversified Products | Intersegment elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment sales | $ 3 | $ 89 | $ 9 | $ 195 |

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