Goodwill, Intangible Assets and Deferred Charge - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill, Intangible Assets, Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, and Deferred Charges Disclosure [Abstract]
Amortization of intangible assets	$ 15.3	$ (4.9)	$ 15.4	$ (2.2)