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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Significant Accounting Policies [Line Items] |  |  |
Tax cuts and jobs act, reclassification from AOCI to retained earnings, tax effect | $ 27.1 |  |
Amortization expense for the deferred costs |  | $ 7.7 | $ 6.1
Other Assets [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Deferred costs |  | $ 86.1 | $ 83.5

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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