Subsequent Event - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
Percentage of workforce reduction		4.00%			1.00%	2.50%
Expected pre-tax expenses related to severance and employee termination benefit cost				$ 3,200,000	$ 1,800,000	$ 1,900,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of workforce reduction	2.00%
Minimum [Member] | Forecast [Member]
Subsequent Event [Line Items]
Expected pre-tax expenses related to severance and employee termination benefit cost			$ 1,000,000
Maximum [Member] | Forecast [Member]
Subsequent Event [Line Items]
Expected pre-tax expenses related to severance and employee termination benefit cost			$ 1,200,000