Summarizes Activity of the Product Revenue Allowance and Reserve Categories (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	$ 7,347
Credits/payments made for current period and deferred sales	(5,270)
Balance at September 30, 2013	2,077
Allowance for Trade Receivables
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	2,839
Credits/payments made for current period and deferred sales	(1,951)
Balance at September 30, 2013	888
Rebates Chargebacks And Discounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	2,418
Credits/payments made for current period and deferred sales	(1,484)
Balance at September 30, 2013	934
Allowance for Sales Returns
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	72
Balance at September 30, 2013	72
Other Incentive Programs
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	2,018
Credits/payments made for current period and deferred sales	(1,835)
Balance at September 30, 2013	$ 183

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.

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

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

+ References

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesDeductions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration