Accumulated Other Comprehensive Loss - Summary of Activity in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (2,910)
Other comprehensive income before reclassifications			125
Reclassifications from accumulated comprehensive loss to net income	$ 105	$ 143	211	$ 287
Total other comprehensive income	199	$ 122	336	$ 197
Ending Balance	(2,574)		(2,574)
Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(35)
Other comprehensive income before reclassifications			91
Reclassifications from accumulated comprehensive loss to net income			29
Total other comprehensive income			120
Ending Balance	85		85
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(2,875)
Other comprehensive income before reclassifications			34
Reclassifications from accumulated comprehensive loss to net income			182
Total other comprehensive income			216
Ending Balance	$ (2,659)		$ (2,659)