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Retirement Savings Plan (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching contributions | $ 2.8 | $ 2.4 | $ 2.1
First 3.0% [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company matching contribution percentage | 100.00% |  |
Percentage of employee's gross pay matched | 3.00% |  |
Next 2.0% [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company matching contribution percentage | 50.00% |  |
Percentage of employee's gross pay matched | 2.00% |  |

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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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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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- Details
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