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Long-Term Debt - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2015 $ / shares	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Debt Instrument [Line Items]
Convertible debt, conversion ratio	16.0173
Convertible debt, conversion price	$ 62.43
Interest expense | $		$ 2,679	$ 2,609	$ 5,340	$ 5,183
Non-cash interest expense | $		$ 876	$ 806	$ 1,734	$ 1,588
Debt discount, remaining amortization period				3 years 8 months 12 days
Minimum [Member]
Debt Instrument [Line Items]
Cash dividends on common stock	0.275
Maximum [Member]
Debt Instrument [Line Items]
Cash dividends on common stock	$ 0.300

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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