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Reconciliation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 16,356us-gaap_NetIncomeLoss	$ 4,491us-gaap_NetIncomeLoss	$ 18,676us-gaap_NetIncomeLoss	$ 12,035us-gaap_NetIncomeLoss	$ 16,536us-gaap_NetIncomeLoss	$ 18,600us-gaap_NetIncomeLoss	$ 18,610us-gaap_NetIncomeLoss	$ 15,364us-gaap_NetIncomeLoss	$ 51,558us-gaap_NetIncomeLoss	$ 69,110us-gaap_NetIncomeLoss	$ 67,953us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic									36,590us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	36,829us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	37,053us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and restricted stock									142us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	153us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	132us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares outstanding - diluted									36,732us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	36,982us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	37,185us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share - basic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 1.41us-gaap_EarningsPerShareBasic	$ 1.88us-gaap_EarningsPerShareBasic	$ 1.83us-gaap_EarningsPerShareBasic
Earnings per share - diluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 1.40us-gaap_EarningsPerShareDiluted	$ 1.87us-gaap_EarningsPerShareDiluted	$ 1.83us-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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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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