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Components of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net earnings (loss) available to common shareholders (A)	$ (9,076)us-gaap_NetIncomeLoss	$ (160,694)us-gaap_NetIncomeLoss	$ 60,907us-gaap_NetIncomeLoss	$ 43,673us-gaap_NetIncomeLoss	$ 43,417us-gaap_NetIncomeLoss	$ 12,583us-gaap_NetIncomeLoss	$ 54,172us-gaap_NetIncomeLoss	$ 30,083us-gaap_NetIncomeLoss	$ (65,190)us-gaap_NetIncomeLoss	$ 140,255us-gaap_NetIncomeLoss	$ 150,750us-gaap_NetIncomeLoss
Weighted average outstanding shares of common stock, basic (B)									48,658,840us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	49,392,749us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	49,550,391us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of options and restricted stock awards										287,365us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	183,649us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common stock and equivalents (C)									48,658,840us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	49,680,114us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	49,734,040us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share, basic (A/B)	$ (0.19)us-gaap_EarningsPerShareBasic	$ (3.31)us-gaap_EarningsPerShareBasic	$ 1.23us-gaap_EarningsPerShareBasic	$ 0.88us-gaap_EarningsPerShareBasic	$ 0.88us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic	$ 1.10us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic	$ (1.34)us-gaap_EarningsPerShareBasic	$ 2.84us-gaap_EarningsPerShareBasic	$ 3.04us-gaap_EarningsPerShareBasic
Earnings per share, diluted (A/C)	$ (0.19)us-gaap_EarningsPerShareDiluted	$ (3.31)us-gaap_EarningsPerShareDiluted	$ 1.22us-gaap_EarningsPerShareDiluted	$ 0.88us-gaap_EarningsPerShareDiluted	$ 0.88us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 1.09us-gaap_EarningsPerShareDiluted	$ 0.61us-gaap_EarningsPerShareDiluted	$ (1.34)us-gaap_EarningsPerShareDiluted	$ 2.82us-gaap_EarningsPerShareDiluted	$ 3.03us-gaap_EarningsPerShareDiluted
Antidilutive options and restricted stock shares									284,635us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	34,486us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	82,758us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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