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Commitments, Contingencies and Off-Balance Sheet Arrangements - Litigation, Regulatory and Taxation Matters- Additional Information (Detail) $ in Millions	12 Months Ended	24 Months Ended
	Dec. 31, 2018 Companies	Dec. 31, 2018 USD ($)
Minimum [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of micro-captive insurance companies organized or managed \| Companies	100
Maximum [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Micro-captive operations, net earnings		$ 3.2
Micro-captive operations, EBITDAC		$ 5.0