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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Debt Security [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | $ 19,250 | $ 16,050 | $ 9,000 | $ 12,220
Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 19,989 | 19,474 |  |
Contingent consideration | (28,180) |  |  |
Deferred compensation plan, Liabilities | (1,291) | (1,379) |  |
Liabilities fair value, Total | (29,471) | (1,379) |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 520 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 219 |  |  |
Deferred compensation plan, Liabilities | (1,291) |  |  |
Liabilities fair value, Total | (1,291) |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 19,250 |  |  |
Contingent consideration | (28,180) |  |  |
Liabilities fair value, Total | (28,180) |  |  |
Fair Value, Measurements, Recurring [Member] | Collective Trust Funds [Member] | Other Noncurrent Assets [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value |  | 100 |  |
Fair Value, Measurements, Recurring [Member] | Treasury Securities [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 520 | 556 |  |
Fair Value, Measurements, Recurring [Member] | Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 520 |  |  |
Fair Value, Measurements, Recurring [Member] | Equity Warrants [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value |  | 311 |  |
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 219 | 2,457 |  |
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 219 |  |  |
Fair Value, Measurements, Recurring [Member] | Debt Security [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | 19,250 | $ 16,050 |  |
Fair Value, Measurements, Recurring [Member] | Debt Security [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets fair value | $ 19,250 |  |  |

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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