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Summary of Significant Accounting Policies - Fair Value Measurements (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration | $ 51,100,000 | $ 18,700,000 | $ 1,000,000
Acquisitions that have maximum payouts | 139,500,000 |  |
Change in fair value of contingent consideration | 5,171,000 | 0 | $ 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration | $ 65,700,000 | $ 19,500,000 |
Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value inputs discount rate | 12.00% | 12.50% | 12.00%
Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value inputs discount rate | 14.00% | 14.50% | 16.00%
Contingent Consideration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration, payments | $ 0 |  | $ 0
Contingent Consideration | Minimum | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value inputs discount rate | 0.90% |  |
Fair value inputs expected volatility rate | 23.00% |  |
Contingent Consideration | Maximum | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value inputs discount rate | 2.30% |  |
Fair value inputs expected volatility rate | 32.70% |  |
Acquisition Without Maximum Earn-Out | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration | $ 1,000,000 |  |
Acquisitions 2016 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration |  | $ 18,683,000 |
Acquisitions that have maximum payouts |  | $ 39,500,000 |

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