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Acquisition - Acquisition Acquired Activities (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue, Consolidated As Reported | $ 149,836 | $ 168,779 | $ 172,229 | $ 201,189 | $ 135,965 | $ 149,312 | $ 153,936 | $ 187,325 | $ 692,033 | $ 626,538 | $ 591,270
Revenue, Pro Forma Adjustments |  |  |  |  |  |  |  |  |  | 44,879 |
Revenue, Pro Forma Consolidated |  |  |  |  |  |  |  |  |  | 671,417 |
Net income | (3,947) | 62,360 | 9,147 | 18,303 | 1,206 | 5,307 | 5,848 | 18,785 | 85,863 | 31,146 | 28,007
Net income, Pro Forma Adjustments |  |  |  |  |  |  |  |  |  | 4,585 |
Net income, Pro Forma Consolidated |  |  |  |  |  |  |  |  |  | $ 35,731 |
Earnings per share from continuing operations: |  |  |  |  |  |  |  |  |  |  |
Basic, Consolidated As Reported | $ (0.08) | $ 1.28 | $ 0.18 | $ 0.37 | $ 0.02 | $ 0.11 | $ 0.12 | $ 0.38 | $ 1.77 | $ 0.63 | $ 0.57
Basic, Pro Forma Adjustments |  |  |  |  |  |  |  |  |  | $ 0.09 |
Basic, Pro Forma Consolidated |  |  |  |  |  |  |  |  |  | $ 0.72 |
Diluted, Consolidated As Reported | $ (0.08) | $ 1.27 | $ 0.18 | $ 0.37 | $ 0.02 | $ 0.11 | $ 0.12 | $ 0.38 | $ 1.75 | $ 0.63 | $ 0.56
Dilutes, Pro Forma Adjustments |  |  |  |  |  |  |  |  |  | $ 0.09 |
Diluted, Pro Forma Consolidated |  |  |  |  |  |  |  |  |  | $ 0.72 |
Weighted average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic, Weighted average common shares outstanding | 46,981 | 48,504 | 49,639 | 49,417 | 48,967 | 48,895 | 49,041 | 49,103 | 48,632 | 49,002 | 49,328
Basic, Weighted average common shares outstanding Pro Forma Adjustments |  |  |  |  |  |  |  |  |  | 435 |
Basic, Weighted average common shares outstanding Pro Forma Consolidated |  |  |  |  |  |  |  |  |  | 49,437 |
Diluted, Weighted average common shares outstanding | 46,981 | 49,003 | 49,929 | 49,836 | 48,967 | 49,109 | 49,244 | 49,531 | 49,141 | 49,252 | 49,599
Diluted, Weighted average common shares outstanding Pro Forma Adjustments |  |  |  |  |  |  |  |  |  | 419 |
Diluted, Weighted average common shares outstanding Pro Forma Consolidated |  |  |  |  |  |  |  |  |  | 49,671 |

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