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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) | Jul. 05, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent consideration | $ 15,092,000 | $ 895,000
ZTEC Instruments, Inc. |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent consideration | $ 0 |

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