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Acquisitions - Summary of Components of Purchase Consideration Transferred and Preliminary Allocation of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Goodwill | $ 543,125 | $ 515,321 | $ 477,532
Two Thousand Nineteen Acquisitions [Member] |  |  |
Assets |  |  |
Cash and cash equivalents | 922 |  |
Goodwill | 27,798 |  |
Receivables, net | 4,348 |  |
Fixed Assets, net | 15 |  |
Other intangible assets, net | 2,075 |  |
Other assets | 236 |  |
Total assets | 35,394 |  |
Current liabilities |  |  |
Current portion of accounts payable, accrued expenses and other liabilities | 1,365 |  |
Accrued compensation | 2,125 |  |
Total liabilities | 3,490 |  |
Net assets acquired | $ 31,904 |  |
Two Thousand Eighteen Acquisitions [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 1,110 |
Goodwill |  | 42,188 |
Receivables, net |  | 50,731 |
Fixed Assets, net |  | 1,276 |
Other intangible assets, net |  | 4,677 |
Other assets |  | 2,894 |
Total assets |  | 102,876 |
Current liabilities |  |  |
Current portion of accounts payable, accrued expenses and other liabilities |  | 15,937 |
Accrued compensation |  | 26,765 |
Total liabilities |  | 42,702 |
Net assets acquired |  | $ 60,174 |

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