Summary of Significant Accounting Policies (Goodwill and Other Intangibles) - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Dec. 31, 2015 USD ($) Reporting_Unit	Jun. 30, 2016 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Non-cash charge for impairment of goodwill	$ 39,800,000	$ 0
Decrease in fair value of reporting units considered for impairment calculation	10.00%
Intangible asset impairment charges	$ 12,100,000
Number of reporting units impacted impairment charge | Reporting_Unit	2