Schedule II Valuation and Qualifying Accounts - 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	$ 13,960	$ 14,850	$ 12,083
Charged to (Reduction in) Costs and Expenses	(1,515)	3,987	5,045
Other	386	(2,155)	0
Deductions	(7,713)	(2,722)	(2,278)
Balance at End of Period	5,118	13,960	14,850
Valuation Allowance of Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	10,968	13,177	8,733
Charged to (Reduction in) Costs and Expenses	1,080	(2,209)	4,444
Other	0	0	0
Deductions	0	0	0
Balance at End of Period	$ 12,048	$ 10,968	$ 13,177