Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill			$ 0	$ 0
Amortization expense for intangible assets	$ 11,400,000	$ 12,700,000	$ 22,700,000	$ 25,400,000