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Earnings Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) d $ / shares shares	Sep. 30, 2016 $ / shares shares	Sep. 30, 2017 $ / shares shares	Sep. 30, 2016 $ / shares shares	Dec. 31, 2016 $ / shares shares
Earnings Per Share [Line Items]
Participating securities outstanding	0	0	0	0
Stock options, outstanding	749,669		749,669		882,748
Stock options, weighted average exercise price | $ / shares	$ 20.84		$ 20.84		$ 16.88
Common stock excluded from calculation of diluted earnings per share	162,544	253,754	326,572	348,608
Conversion premium of the notes	842,206	0	496,402	0
2.125% Convertible Senior Notes due 2021
Earnings Per Share [Line Items]
Notes threshold percentage of stock price trigger	130.00%
Notes threshold trading days | d	20
Notes threshold consecutive trading days | d	30
Debt Instrument conversion amount | $	$ 0
Option To Purchase Common Stock
Earnings Per Share [Line Items]
Stock options, outstanding	749,669	1,198,673	749,669	1,198,673
Stock options, weighted average exercise price | $ / shares	$ 20.84	$ 12.03	$ 20.84	$ 12.03
Restricted Stock Units (RSUs)
Earnings Per Share [Line Items]
Common stock excluded from calculation of diluted earnings per share			515,468

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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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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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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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This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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Number of options outstanding, including both vested and non-vested options.

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