
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S FINANCIAL STATEMENTS FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 
AND THE YEAR ENDED DECEMBER 31, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               SEP-30-1997             DEC-31-1996
<CASH>                                         130,795                  80,181
<SECURITIES>                                         0                       0
<RECEIVABLES>                                  179,455                 129,399
<ALLOWANCES>                                     6,425                   4,016
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                               321,483                 217,748
<PP&E>                                               0                       0
<DEPRECIATION>                                       0                       0
<TOTAL-ASSETS>                                 537,149                 416,012
<CURRENT-LIABILITIES>                          123,363                  86,561
<BONDS>                                          4,829                   5,069
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            91                      90
<OTHER-SE>                                     392,872                 308,355
<TOTAL-LIABILITY-AND-EQUITY>                   537,149                 416,012
<SALES>                                              0                       0
<TOTAL-REVENUES>                               934,399                 898,635
<CGS>                                                0                       0
<TOTAL-COSTS>                                  563,165                 545,343
<OTHER-EXPENSES>                                 3,693                   5,405
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                             (2,840)                 (2,243)
<INCOME-PRETAX>                                113,100                 103,645
<INCOME-TAX>                                    46,339                  42,543
<INCOME-CONTINUING>                             66,761                  61,102
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    66,761                  61,102
<EPS-PRIMARY>                                      .71                    0.67
<EPS-DILUTED>                                      .71                    0.67
        

</TABLE>
