Income Per Share - Additional Information (Detail) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 3.75% Convertible Senior Notes [Member]	Dec. 31, 2013 3.75% Convertible Senior Notes [Member]
Earnings Per Share [Line Items]
Stock-based compensation awards outstanding	0	0.1	0	0.1
Interest					3.75%	3.75%
Maturity year of note					2014
Approximate number of common stock share which can be purchased under warrants	9.6		9.6
Adjusted strike price under warrant	25.01		25.01
Loss on call spread modification related to convertible notes	$ 4,952	$ 4,869	$ 4,952	$ 4,869

Year of maturity of outstanding debt instrument.

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- Definition

Deduction from net income in calculating net income available to common stockholders and earnings per share available to common stockholders as a result of agreements with the note hedge counterparties associated with the convertible notes to reduce the number of options or warrants outstanding.

+ References

No definition available.

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- 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

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-Section 50

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-Glossary Diluted Earnings Per Share

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

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-Publisher FASB

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-Topic 235

-SubTopic 10

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

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