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Summary of Significant Accounting Policies - Summary of Basic and Diluted Weighted Average Common Shares (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	18,713us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	20,861us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	22,500us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common equivalent shares	294us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	492us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	429us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average common shares outstanding	19,007us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	21,353us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	22,929us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: 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

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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 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6528421

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