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Equity Based Plans - Summary of Stock Options Granted Under the Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding, Beginning Balance	75,840	348,810	723,890
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 14.71	$ 14.30	$ 14.30
Number of Shares, Granted	648,346		0
Number of Shares, Exercised	(879,391)	(272,750)	(375,080)
Number of Shares, Cancelled		(220)
Number of Shares, Forfeited
Number of Shares, Outstanding, Ending Balance	38,700	75,840	348,810	723,890
Number of Shares, Exercisable, Ending Balance	38,700	75,840	348,810
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised	$ 15.25	$ 14.12	$ 13.92
Weighted Average Exercise Price, Cancelled		$ 17.89
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 18.36	$ 14.71	$ 14.30	$ 14.30
Weighted Average Exercise Price, Exercisable, Ending Balance
Weighted Average Remaining Contractual Term	1 year 7 months 6 days	2 years 2 months 12 days	2 years 7 months 6 days	3 years 7 months 6 days
Weighted Average Remaining Contractual Term, Exercisable	1 year 7 months 6 days
Aggregate Intrinsic Value, Exercisable	$ 654,000

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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 options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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

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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 option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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