Other Current Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Supplemental Balance Sheet Information [Line Items]
Other receivables and current assets	$ 216,268	$ 163,296
Accounts Receivable Current Portion Of Annual Lease Licenses And Software Maintenance [Member]
Supplemental Balance Sheet Information [Line Items]
Other receivables and current assets	149,300	112,800
Taxes Receivable Related To Overpayments And Refunds
Supplemental Balance Sheet Information [Line Items]
Other receivables and current assets	$ 48,900	$ 36,000

Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5

Name:	us-gaap_OtherAssetsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant