Computation of Earnings (Loss) Per Share - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 33,958	$ 14,290
Interest expense on Convertible Senior Notes, net of tax	2,144	0
Net income used for diluted earnings per share, if-converted method	$ 36,102	$ 14,290
Shares used in basic and diluted per share calculation (in shares)	35,236	33,202
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	4,957	0
Effect of dilutive stock options and restricted stock units (in shares)	1,755	796
Shares used in diluted per share calculation (in shares)	41,948	33,998
Stock options [Member]
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from calculation of diluted (loss) earnings per share ("EPS")	193	1,972
Senior 3 Point 25 Percent Convertible Notes Due 2020 [Member] \| Convertible Debt [Member]
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Senior Credit Facility, applicable margin			3.25%

Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

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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.

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

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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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.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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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.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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