Income Taxes - Reconciliation of the Company's Effective Income Tax Rate to the Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal income tax at the statutory rate	$ 11,236	$ 9,812	$ 7,914
State income taxes, net of federal benefit	1,433	1,283	969
Permanent differences	98	(96)	156
Research and development	(452)	(386)	(327)
Return to provision adjustment	28	(361)	(270)
Change in liability for unrecognized tax benefits	202	219	921
Incentive stock option detriment/(benefit)	(616)	(538)	174
Change in valuation allowance	500	0	(1,429)
Other	(36)	(143)	(234)
Provision for income taxes	$ 12,393us-gaap_IncomeTaxExpenseBenefit	$ 9,790us-gaap_IncomeTaxExpenseBenefit	$ 7,874us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	38.40%	34.90%	34.80%

Income tax reconciliation change in liability for unrecognized tax benefits.

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Income tax reconciliation permanent difference.

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Income tax reconciliation return to provision adjustment.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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