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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ (565) | $ 10,987 | $ 8,387 | $ 21,798 | $ (774) | $ 9,589 | $ 6,685 | $ 19,503 | $ 40,607 | $ 35,003 | $ 30,414
Basic |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding | 53,019 | 52,648 | 52,031 | 51,572 | 51,669 | 51,736 | 49,464 | 48,146 | 52,321 | 50,280 | 48,343
Diluted |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  | 870 | 876 | 761
Restricted stock awards |  |  |  |  |  |  |  |  | 261 | 277 | 293
Contingent shares |  |  |  |  |  |  |  |  | 61 | 29 | 129
Convertible senior subordinated notes |  |  |  |  |  |  |  |  |  | 1,231 | 1,961
Diluted weighted average common shares outstanding | 53,019 | 53,846 | 53,079 | 52,745 | 51,669 | 54,445 | 52,024 | 51,385 | 53,513 | 52,693 | 51,487
Basic earnings per share from continuing operations | $ (0.01) | $ 0.21 | $ 0.16 | $ 0.42 | $ (0.02) | $ 0.19 | $ 0.14 | $ 0.41 | $ 0.78 | $ 0.70 | $ 0.63
Diluted earnings per share from continuing operations | $ (0.01) | $ 0.20 | $ 0.16 | $ 0.41 | $ (0.02) | $ 0.18 | $ 0.13 | $ 0.38 | $ 0.76 | $ 0.66 | $ 0.59

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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4613673-111683 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 55 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2626-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 48 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2538-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingently Issuable Shares -URI http://asc.fasb.org/extlink&oid=6508586 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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