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Selected Quarterly Data | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Data | Selected Quarterly Data (unaudited) The following table represents unaudited selected quarterly financial data for the two years ended December 31, 2012. Beginning with quarter ended December 31, 2011, the selected quarterly financial data includes the results of ECP, which was acquired effective October 1, 2011. The operating results for any quarter are not necessarily indicative of the results for any future period.
| Quarter Ended
(In thousands, except per share data) | Mar. 31 |  | Jun. 30 |  | Sep. 30 |  | Dec. 31
2011 |  |  |  |  |  |  |
Revenue | $ | 786,648 |  |  | $ | 759,684 |  |  | $ | 783,898 |  |  | $ | 939,632 |
Gross margin(1) | 343,646 |  |  | 322,236 |  |  | 334,322 |  |  | 391,789 |
Operating income(1) | 107,371 |  |  | 78,486 |  |  | 85,488 |  |  | 90,138 |
Net income(2) | 58,182 |  |  | 46,706 |  |  | 49,231 |  |  | 56,145 |
Basic earnings per share(3) | $ | 0.20 |  |  | $ | 0.16 |  |  | $ | 0.17 |  |  | $ | 0.19 |
Diluted earnings per share(3) | $ | 0.20 |  |  | $ | 0.16 |  |  | $ | 0.17 |  |  | $ | 0.19 |
| Quarter Ended
(In thousands, except per share data) | Mar. 31 |  | Jun. 30 |  | Sep. 30 |  | Dec. 31
2012 |  |  |  |  |  |  |
Revenue | $ | 1,031,777 |  |  | $ | 1,006,531 |  |  | $ | 1,016,707 |  |  | $ | 1,067,915 |
Gross margin(1) | 447,383 |  |  | 421,931 |  |  | 409,705 |  |  | 445,121 |
Operating income(1) | 133,608 |  |  | 108,567 |  |  | 91,434 |  |  | 104,344 |
Net income(2) | 80,991 |  |  | 63,998 |  |  | 54,048 |  |  | 62,188 |
Basic earnings per share(3) | $ | 0.28 |  |  | $ | 0.22 |  |  | $ | 0.18 |  |  | $ | 0.21 |
Diluted earnings per share(3) | $ | 0.27 |  |  | $ | 0.21 |  |  | $ | 0.18 |  |  | $ | 0.21 |
(1) | Gross margin and operating income during the quarters ended March 31, 2012, June 30, 2012, September 30, 2012 and December 31, 2012 include gains of $8.3 million, $8.4 million, $0.5 million and $0.7 million, respectively, resulting from lawsuit settlements with certain of our aftermarket product suppliers as discussed in Note 8, "Commitments and Contingencies."
(2) | Net income during the quarters ended June 30, 2011 and December 31, 2011 includes a gain of $1.6 million and a loss of $0.2 million, respectively, for changes in fair value of our contingent consideration liabilities. The quarters ended March 31, 2012 and December 31, 2012 include gains for changes in fair value of our contingent consideration liabilities of $1.3 million and $0.2 million, respectively, while the quarters ended June 30, 2012 and September 30, 2012 include losses of $1.2 million and $1.9 million, respectively. See Note 7, "Fair Value Measurements," for further information on these changes in fair value of the contingent consideration obligations recorded in earnings during the periods.
(3) | The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in weighted average shares outstanding throughout the year.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 23, 24 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 30 -Subparagraph a-j -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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