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Reconciliation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 10,276us-gaap_NetIncomeLoss	$ 12,035us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic	36,156us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	36,661us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and restricted stock	13us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	63us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares outstanding - diluted	36,169us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	36,724us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share - basic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic
Earnings per share - diluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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