Employee Benefit Plans - Changes in Plan Assets (Detail) - Pension Benefit Plan [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		$ 1,300	$ 1,550
Actual return on plan assets		2	46
Employer contributions	$ 741	741	0
Benefits paid		(2,043)	(296)	$ (342)
Fair value of plan assets at end of year		$ 0	$ 1,300	$ 1,550