Accumulated Other Comprehensive Loss - Summary of Reclassifications from Accumulated Other Comprehensive Loss to Net (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Amortization of defined benefit plan pension items:
Amortization of loss	$ 154	$ 217	$ 308	$ 434
Income tax effect	(63)	(89)	(126)	(178)
After tax	91	128	182	256
Amortization of loss on interest rate swap:
Reclassification to interest expense	24	26	49	53
Income tax effect	(10)	(11)	(20)	(22)
After tax	14	15	29	31
Total reclassifications, net of income tax	$ 105	$ 143	$ 211	$ 287