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Common and Common Equivalent Shares - Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Weighted average shares, Basic	98,066us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,088us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	98,411us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,076us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,469us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,506us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,116us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	98,618us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	98,588us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,112us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	97,386us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average number of dilutive common share equivalents									1,299us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1,857us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1,996us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares, Diluted	99,129us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,145us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	99,866us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,696us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	101,080us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	101,178us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	101,098us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,784us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	99,887us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,969us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	99,382us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive securities not included in the diluted net income per common share calculation									1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	35us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	58us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ 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 (c)

-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

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

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



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- Definition

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

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-Section 50

-Paragraph 1

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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

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



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