Schedule II - Consolidated Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 3,040	$ 3,100	$ 3,199
Charged/(Credited) to Expense	815	492	450
Other Adjustments	79	56	331
Deductions	(1,384)	(608)	(880)
Balance at End of Period	2,550	3,040	3,100
Deferred tax valuation allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	1,206	1,361	1,432
Charged/(Credited) to Expense	$ (1,206)	(155)	(71)
Balance at End of Period		$ 1,206	$ 1,361