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Fair Value Measurements - Summary of Assets and (Liabilities) Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | $ 60,707 | $ 56,556 | $ 51,101
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets | 100,365 | 84,435 |
Available-for-sale debt securities | 60,707 | 56,556 |
Deferred compensation plan liabilities | (100,365) | (84,435) |
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate swaps | (427) | 1,096 |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent purchase price liabilities | $ (28,005) | $ (39,708) |

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