Consolidated Valuation and Qualifying Accounts and Reserves (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 573	$ 304	$ 289
Charges (Reversals) to Cost or Expenses	1,261	291	241
Deductions	(123)	(22)	(226)
Balance at End of Year	1,711	573	304
Allowance for sales returns
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year				110
Balance at End of Year	110	110	110	110
Allowance for tax valuation
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	35,566	33,341	33,784
Charges (Reversals) to Cost or Expenses	6,503	2,225	(443)
Balance at End of Year	$ 42,069	$ 35,566	$ 33,341

Valuation allowances and reserved charges to cost and expense and recoveries.

No definition available.

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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

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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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.

+ References

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