Schedule II - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of year	$ 2,725	$ 2,858	$ 2,861
Provision	1,061	945	71
Write-offs, recoveries and discounts allowed	(946)	(1,119)	(91)
Other	(137)	41	17
Balance, end of year	2,703	2,725	2,858
Allowance for Sales Discounts and Deductions [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of year	1,810	2,302	2,831
Provision	4,356	5,526	3,661
Write-offs, recoveries and discounts allowed	(4,719)	(6,148)	(4,173)
Other	362	130	(17)
Balance, end of year	$ 1,809	$ 1,810	$ 2,302

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

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Total of recoveries of amounts due the Entity that had previously been written off as uncollectible using allowances (the valuation accounts that are netted against the cost of an asset to value it at its carrying value) and total of reestablishments of reserves (liabilities established to represent expected future costs) that had previously been utilized.

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