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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited) The following tabulation shows certain quarterly financial data for 2018 and 2017 (in thousands, except per share amounts):
| Quarter
2018 | 1 |  | 2 |  | 3 |  | 4
Net service revenues | $ | 1,395,333 |  |  | $ | 1,457,054 |  |  | $ | 1,466,226 |  |  | $ | 1,481,658 |
Gross margin | $ | 572,366 |  |  | $ | 607,118 |  |  | $ | 610,468 |  |  | $ | 620,062 |
Income before income taxes | $ | 134,639 |  |  | $ | 150,075 |  |  | $ | 151,905 |  |  | $ | 154,983 |
Net income | $ | 96,167 |  |  | $ | 109,315 |  |  | $ | 115,242 |  |  | $ | 113,564 |
Basic net income per share | $ | .79 |  |  | $ | .90 |  |  | $ | .96 |  |  | $ | .96 |
Diluted net income per share | $ | .78 |  |  | $ | .89 |  |  | $ | .95 |  |  | $ | .95 |
| 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 |

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- References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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_
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