Accrued Warranty Costs - Changes in Product Warranty Obligation (Accrued Warranty Costs) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Disclosure Accrued Product Warranty Costs [Abstract]
Balance at beginning of period	$ 8,817us-gaap_ProductWarrantyAccrual	$ 7,297us-gaap_ProductWarrantyAccrual
Amounts charged to SG&A	2,099	2,227
Costs incurred	(1,882)us-gaap_ProductWarrantyAccrualPayments	(1,946)us-gaap_ProductWarrantyAccrualPayments
Balance at end of period	$ 9,034us-gaap_ProductWarrantyAccrual	$ 7,578us-gaap_ProductWarrantyAccrual

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(5))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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