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Equity Compensation Plans - Unrecognized Compensation Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |  |  |
Unrecognized compensation cost at beginning of period |  |  | $ 20,269 |
Equity grants |  |  | 8,991 |
Equity grant forfeitures |  |  | (556) |
Equity compensation expense | $ (2,835) | $ (2,261) | (9,112) | $ (7,415)
Unrecognized Compensation Cost at End of Period | 19,592 |  | 19,592 |
Incentive Plans | Restricted Stock |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |  |  |
Unrecognized compensation cost at beginning of period |  |  | 1,091 |
Equity grants |  |  | 2,758 |
Equity grant forfeitures |  |  | (387) |
Equity compensation expense |  |  | (813) |
Unrecognized Compensation Cost at End of Period | 2,649 |  | 2,649 |
Incentive Plans | Deferred Stock Units |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |  |  |
Unrecognized compensation cost at beginning of period |  |  | 12,304 |
Equity grants |  |  | 5,997 |
Equity grant forfeitures |  |  | (169) |
Equity compensation expense |  |  | (5,561) |
Unrecognized Compensation Cost at End of Period | 12,571 |  | 12,571 |
Incentive Plans | Performance Stock Units |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |  |  |
Unrecognized compensation cost at beginning of period |  |  | 6,874 |
Equity grants |  |  | 0 |
Equity compensation expense |  |  | (2,563) |
Unrecognized Compensation Cost at End of Period | 4,311 |  | 4,311 |
Employee Stock Purchase Plan |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |  |  |
Equity grants |  |  | 236 |
Equity compensation expense |  |  | (175) |
Unrecognized Compensation Cost at End of Period | $ 61 |  | $ 61 |

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- Definition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] + References No definition available. + Details
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- Definition Represents the amount of equity grant forfeitures during the period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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