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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited) The following tabulation shows certain quarterly financial data for 2017 and 2016 (in thousands, except per share amounts):
| Quarter
2017 | 1 |  | 2 |  | 3 |  | 4
Net service revenues | $ | 1,287,370 |  |  | $ | 1,308,428 |  |  | $ | 1,324,709 |  |  | $ | 1,346,282 |
Gross margin | $ | 525,828 |  |  | $ | 538,438 |  |  | $ | 546,400 |  |  | $ | 553,146 |
Income before income taxes | $ | 125,501 |  |  | $ | 130,707 |  |  | $ | 132,270 |  |  | $ | 129,038 |
Net income | $ | 78,521 |  |  | $ | 80,316 |  |  | $ | 84,700 |  |  | $ | 47,047 |
Basic net income per share | $ | .63 |  |  | $ | .64 |  |  | $ | .69 |  |  | $ | .38 |
Diluted net income per share | $ | .62 |  |  | $ | .64 |  |  | $ | .68 |  |  | $ | .38 |
| Quarter
2016 | 1 |  | 2 |  | 3 |  | 4
Net service revenues | $ | 1,302,625 |  |  | $ | 1,344,160 |  |  | $ | 1,338,541 |  |  | $ | 1,265,073 |
Gross margin | $ | 531,972 |  |  | $ | 556,993 |  |  | $ | 552,509 |  |  | $ | 519,202 |
Income before income taxes | $ | 133,791 |  |  | $ | 149,414 |  |  | $ | 146,324 |  |  | $ | 124,581 |
Net income | $ | 83,416 |  |  | $ | 91,616 |  |  | $ | 90,569 |  |  | $ | 77,788 |
Basic net income per share | $ | .65 |  |  | $ | .71 |  |  | $ | .71 |  |  | $ | .61 |
Diluted net income per share | $ | .64 |  |  | $ | .71 |  |  | $ | .71 |  |  | $ | .61 |

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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