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Insurance Operations - Beginning and Ending Balances and Changes in DPAC (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Insurance [Abstract]
DPAC, beginning of period	$ 88,756	$ 73,591	$ 73,059	$ 64,912
Capitalized Costs	44,389	36,999	136,758	110,653
Amortization of DPAC	(42,502)	(34,656)	(119,174)	(99,631)
DPAC, end of period	$ 90,643	$ 75,934	$ 90,643	$ 75,934

X

- Definition

Amount of amortization expense (reversal of expense) for deferred policy acquisition costs.

+ References

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- Definition

Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date.

+ References

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- Definition

Total amount of policy acquisition costs capitalized during the income statement period.

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