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Fair Values of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
System Transformation Transactions [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Increase in acquisition related contingent consideration | $ 62.5

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- Definition Business combination change in acquisiton related contingent consideration. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |