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ESPP shares sold to-date

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Length of time of deferral period under condition one.

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Length of time of deferral period under condition three.

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Length of time of deferral period under condition two.

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Percentage of cash value of cash bonus officers could elect to receive in form of restricted stock.

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Percentage of employee compensation for purchase of common stock under ESPP.

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Percentage of premium on amount deferred based on length of time for one year under condition one.

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Percentage of premium on amount deferred based on length of time for one year under condition three

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Percentage of premium on amount deferred based on length of time for one year under condition two

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hare-based Compensation Arrangement by Share-based Payment Award, Purchase Period

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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The cash outflow to reacquire common stock during the period.

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Aggregate number of nonredeemable preferred shares reserved for future issuance.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on purchase date that participants pay for shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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Amount remaining of a stock repurchase plan authorized.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 23, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Bonus Liability		$ 900	$ 500	$ 400
Preferred stock, shares authorized		5,000,000	5,000,000	5,000,000
Preferred stock, shares outstanding			0	0
Weighted- average remaining contractual term, exercisable (in years)		3 years 11 months 25 days
Restricted stock granted (in shares)		349,000	185,000	171,000
Share-based compensation expense recognized		$ 9,061	$ 7,986	$ 7,419
Exercise price of stock (in dollars per share)		$ 18.54	$ 17.49	$ 17.44	$ 16.37
Available for future grant, (in shares)		1,848,000
Deferred period of grants (Condition 1)		1 year
Percentage of premium on amount deferred (Condition 1)		10.00%
Deferred period of grants (Condition 2)		2 years
Percentage of premium on amount deferred (Condition 2)		20.00%
Deferred period of grants (Condition 3)		4 years
Percentage of premium on amount deferred (Condition 3)		30.00%
Minimum percentage of common stock under payroll deductions		10.00%
Fair value of payroll deductions		85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Period		6 years
Stock sold under the plan (in shares)		1,272,274
Capital shares reserved for future issuance (In shares)		227,726
Payments for repurchase of common stock		$ 541	$ 20,168	$ 30,934
Stock-based compensation expense		$ 541	$ 20,168	$ 30,934
Exercise of stock options		1,527,000	553,000	168,000
Shares reserved for purchase under ESPP (in shares)		227,726
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted- average remaining contractual term, exercisable (in years)		10 years
Restricted stock granted (in shares)		300,000	200,000	200,000
Performance-based vesting period		4 years
Share-based compensation expense recognized		$ 4,900	$ 2,400	$ 2,000
Employee Deferred Bonus Compensation Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized		$ 100	$ 900	$ 700
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserve under equity incentive plans (in shares)		5,300,000
2010 Plan [Member] \| Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based vesting period		1 year
Non-employee director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		100,000	400,000	500,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of deferred 2011 cash bonus		50.00%
Minimum [Member] \| 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of stock (in dollars per share)		$ 8.50
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of deferred 2011 cash bonus		100.00%
Maximum [Member] \| 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of stock (in dollars per share)		$ 41.36
Share Repurchase Program, Amendment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for repurchase of common stock	$ 50,000
Repurchase of available shares under share repurchase program (in shares)			1,152,386	1,397,000
Stock-based compensation expense			$ 19,600	$ 30,400
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 35,000