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
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		$ 1,300
Actual return on plan assets		2
Employer contributions	$ 741	741
Benefits paid		(2,043)	$ (296)
Fair value of plan assets at end of year		$ 0	$ 1,300