Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended			12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Amortization expense of finite life intangible assets	$ 3,935,000		$ 2,622,000
Amortization expense of finite life intangibles for 2016	10,100,000
Amortization expense of finite life intangibles for 2017	11,600,000
Amortization expense of finite life intangibles for 2018	10,000,000
Amortization expense of finite life intangibles for 2019	8,900,000
Amortization expense of finite life intangibles for 2020	7,100,000
Goodwill	221,717,000	$ 220,163,000		$ 220,163,000	$ 165,861,000
Intangible assets-indefinite life	26,458,000	26,337,000		26,337,000	$ 19,766,000
Impairment of intangible assets				3,340,000
Goodwill or indefinite life intangible asset charges	$ 0
Reporting Unit One [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill impairment charges				0
Goodwill		77,900,000		$ 77,900,000
Estimated fair value of goodwill exceeds from its carrying value				8.00%
Decrease in projected revenue growth rate				1.10%
Decrease in projected operational profit				3.90%
Three Reporting Units [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Intangible assets-indefinite life		$ 10,000,000		$ 10,000,000
Fair value lower than the aggregate carrying value		33.40%		33.40%
Impairment of intangible assets		$ 3,300,000