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Depreciation and Amortization - Depreciation and Amortization Expense Excluded from Operating Expenses (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Component of Operating Other Cost and Expense [Line Items] |  |  |
Depreciation and amortization | $ 296,083 | $ 299,639 | $ 312,703
Direct expenses [Member] |  |  |
Component of Operating Other Cost and Expense [Line Items] |  |  |
Depreciation and amortization | 277,662 | 283,720 | 297,517
General and administrative expenses [Member] |  |  |
Component of Operating Other Cost and Expense [Line Items] |  |  |
Depreciation and amortization | 4,137 | 4,224 | 5,033
Corporate expenses [Member] |  |  |
Component of Operating Other Cost and Expense [Line Items] |  |  |
Depreciation and amortization | $ 14,284 | $ 11,695 | $ 10,153

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- Definition The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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