Summary of Significant Accounting Policies - Schedule of Allowances Against Accounts and Notes Receivable (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation And Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 3,913	$ 4,853	$ 4,478
Additions/ charges to cost and expense for allowances for doubtful accounts	604	611	728
Adjustments (to)/from deferred revenue, net, for accounts where collectability is remote	(160)	170	444
Deductions/ write-offs	(235)	(1,721)	(797)
Ending balance	$ 4,122	$ 3,913	$ 4,853

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 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.

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