Accumulated Other Comprehensive Income (Loss) - Summary of Components of AOCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Accumulated other comprehensive income (loss)	$ (2,977)	$ (4,200)
Foreign currency translation (gain) loss	(100)
Change in fair value of interest rate swap agreements	2,300	1,900
Swap termination	2,500
Income tax (expense) benefit	(1,800)	(700)
Total other comprehensive income (loss)	2,917	1,138	$ (1,977)
Accumulated other comprehensive income (loss)	$ (60)	$ (2,977)	$ (4,200)