Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Line Items]
Impairment of goodwill	$ 988,000	$ 988,000	$ 0
Identity
Goodwill And Intangible Assets Disclosure [Line Items]
Impairment of goodwill	$ 1,000,000