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Revenue and Long-Lived Assets by Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues | $ 1,083,864 | $ 1,075,119 | $ 1,063,228 | $ 1,023,684 | $ 1,034,213 | $ 1,033,173 | $ 1,028,383 | $ 1,015,444 | $ 4,245,895 | $ 4,111,213 | $ 3,776,976
Assets, long-lived | 112,644 |  |  |  | 107,680 |  |  |  | 112,644 | 107,680 | 107,972
Domestic |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 3,219,820 | 3,022,274 | 2,655,443
Assets, long-lived | 92,252 |  |  |  | 86,239 |  |  |  | 92,252 | 86,239 | 87,146
Foreign |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 1,026,075 | 1,088,939 | 1,121,533
Assets, long-lived | $ 20,392 |  |  |  | $ 21,441 |  |  |  | $ 20,392 | $ 21,441 | $ 20,826

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