Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 1,563	$ 1,733		$ 3,167
Additions (reductions) to Costs and Expenses	8,944	6,563		2,116
Write offs	(8,035)	(6,733)		(3,550)
Charged to Other Accounts	0	0		0
Reclassification from Other Accounts	0	0		0
Balance at End of Period	2,472	1,563		1,733
Allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	32,498	35,108		27,056
Additions (reductions) to Costs and Expenses	(813)	(1,793)		9,806
Write offs	0	(817)		(1,754)
Charged to Other Accounts		0	[1]	0
Reclassification from Other Accounts		0		0
Balance at End of Period	$ 31,685	$ 32,498		$ 35,108

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