Variable Interest Entities - Additional Information (Detail) - CUSO [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) Installment	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)
Variable Interest Entity [Line Items]
Other liabilities				$ 1,776
Number of monthly payments | Installment	10
Discount rate	10.00%
Offset amounts under Revolving Note		$ 8,472
Revolving note, amount owned to company	$ 8,300		$ 8,300	$ 8,200