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Equity Compensation Plans - Unrecognized Compensation Cost (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost at beginning of period | $ 20,269 |  |
Equity grants | 15,817 |  |
Equity grant forfeitures | (557) |  |
Equity compensation expense | (11,921) | $ (9,750) | $ (10,077)
Unrecognized Compensation Cost at End of Period | 23,608 | 20,269 |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | (1,000) | (1,000) | (1,000)
Unrecognized Compensation Cost at End of Period | 2,000 |  |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | (7,000) | (6,000) | $ (6,000)
Unrecognized Compensation Cost at End of Period | 14,000 |  |
Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | (3,000) |  |
Unrecognized Compensation Cost at End of Period | 7,000 |  |
Incentive Plans | Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost at beginning of period | 1,091 |  |
Equity grants | 2,781 |  |
Equity grant forfeitures | (387) |  |
Equity compensation expense | (1,092) |  |
Unrecognized Compensation Cost at End of Period | 2,393 | 1,091 |
Incentive Plans | Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost at beginning of period | 12,304 |  |
Equity grants | 9,425 |  |
Equity grant forfeitures | (170) |  |
Equity compensation expense | (7,167) |  |
Unrecognized Compensation Cost at End of Period | 14,392 | 12,304 |
Incentive Plans | Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost at beginning of period | 6,874 |  |
Equity grants | 3,375 |  |
Equity compensation expense | (3,426) |  |
Unrecognized Compensation Cost at End of Period | 6,823 | $ 6,874 |
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity grants | 236 |  |
Equity compensation expense | (236) |  |
Unrecognized Compensation Cost at End of Period | $ 0 |  |

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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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