SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ValuationAndQualifyingAccountsDisclosureLineItems
Valuation Allowances and Reserves, Balance, Beginning Balance	$ 17,776	$ 17,895	$ 23,478
ValuationAllowancesAndReservesChargedToCostAndExpense	1,471	1,951	2,605
ValuationAllowancesAndReservesChargedToOtherAccounts	125	(181)	(299)
ValuationAllowancesAndReservesDeductions	7,050	1,889	7,889
Valuation Allowances and Reserves, Balance, Ending Balance	12,322	17,776	17,895
Reduction of US corporate income tax rate	4,300
ValuationAllowanceOfDeferredTaxAssetsMember
ValuationAndQualifyingAccountsDisclosureLineItems
Valuation Allowances and Reserves, Balance, Beginning Balance	17,776	17,895	23,478
ValuationAllowancesAndReservesChargedToCostAndExpense	1,471	1,951	2,605
ValuationAllowancesAndReservesChargedToOtherAccounts	125	(181)	(299)
ValuationAllowancesAndReservesDeductions	7,050	1,889	7,889
Valuation Allowances and Reserves, Balance, Ending Balance	$ 12,322	$ 17,776	$ 17,895

Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax, Reduction to US Corporate Income Tax Rate

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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