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Compensation Expense Associated with Stock-Settled Performance Units (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Performance Unit Awards 2014 |  |  |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |  |  |
Stock-based compensation expense associated with Stock-Settled Performance Units | $ 449 |  | $ 449 |
Performance Unit Awards 2013 |  |  |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |  |  |
Stock-based compensation expense associated with Stock-Settled Performance Units | 464 | 464 | 928 | 464
Performance Unit Awards 2012 |  |  |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |  |  |
Stock-based compensation expense associated with Stock-Settled Performance Units | 255 | 255 | 510 | 510
Performance Unit Awards 2011 |  |  |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |  |  |
Stock-based compensation expense associated with Stock-Settled Performance Units |  | $ 464 | $ 464 | $ 928

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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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