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Significant Accounting Policies - Reconciliation of Reserve for Warranty Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Beginning balance	$ 6,406	$ 7,539	$ 8,140
Provision	4,724	5,177	7,507
Claims paid/costs incurred	(5,523)us-gaap_ProductWarrantyAccrualPayments	(6,310)us-gaap_ProductWarrantyAccrualPayments	(8,108)us-gaap_ProductWarrantyAccrualPayments
Ending balance	$ 5,607	$ 6,406	$ 7,539

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. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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