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Equity Compensation Plans - Unrecognized Compensation Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period | $ 23,608 |
Equity grants | 5,220 |
Equity grant forfeitures | (3,478) |
Equity compensation (expense) income | 5,818 |
Equity compensation expense | (2,332) | $ (2,738)
Unrecognized Compensation Cost at End of Period | 19,532 |
Deferred Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Equity compensation (expense) income | 3,000 |
Performance Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Equity compensation (expense) income | 600 |
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 | 2,393 |
Equity grants | 1,741 |
Equity grant forfeitures | (1,119) |
Equity compensation (expense) income | (17) |
Unrecognized Compensation Cost at End of Period | 3,032 |
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 | 14,392 |
Equity grants | 3,355 |
Equity grant forfeitures | (150) |
Equity compensation (expense) income | 4,712 |
Unrecognized Compensation Cost at End of Period | 12,885 |
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 | 6,823 |
Equity grants | 0 |
Equity grant forfeitures | (2,209) |
Equity compensation (expense) income | 1,092 |
Unrecognized Compensation Cost at End of Period | 3,522 |
Employee Stock Purchase Plan |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Equity grants | 124 |
Equity compensation (expense) income | 31 |
Unrecognized Compensation Cost at End of Period | $ 93 |

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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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