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Acquisitions - Summary of Purchase Price Allocations Initially Recorded on Consolidated Balance Sheet for all Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Loans At Acquisition Date [Line Items] |  |
Goodwill | $ 502,015 | $ 471,684
Series of Individually Immaterial Business Acquisitions [Member] |  |
Loans At Acquisition Date [Line Items] |  |
Net liabilities | (14,195) |
Goodwill | 34,137 |
Intangible assets | 16,944 |
Deferred tax liability | (1,352) |
Total purchase price consideration | $ 35,534 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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