Employee Benefit Plans - Summary of Net Periodic Benefit Cost Information for Pension Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Service and interest costs	$ 103	$ 35
Expected return on plan assets	(11)	(4)
Amortization of prior service costs	28	6
Net periodic benefit cost	$ 120	$ 37