Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation Allowance for Deferred Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Valuation allowance, Beginning balance	[1]	$ 47,545	$ 150,384	$ 82,876
Valuation allowance, Additions/Charges to Expense	[1]	4,219	(109,805)	71,826
Valuation allowance, Deductions/ Other	[1]	(2,016)	6,966	(4,318)
Valuation allowance, Ending balance	[1]	49,748	47,545	150,384
Valuation Allowance for Accounts Receivable [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Valuation allowance, Beginning balance		20,229	19,097	27,504
Valuation allowance, Additions/Charges to Expense		32,049	22,212	14,864
Valuation allowance, Deductions/ Other		(29,136)	(21,080)	(23,271)
Valuation allowance, Ending balance		$ 23,142	$ 20,229	$ 19,097

[1] Amounts include both continuing and discontinued operations gross deferred tax balances.