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Long-term Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Debt Instrument [Line Items]
Long-term Debt	$ 949,140
Bank credit facility
Debt Instrument [Line Items]
Long-term Debt	360,000
7 3/4% Senior Notes due 2019
Debt Instrument [Line Items]
Long-term Debt	300,000
9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term Debt	$ 289,140

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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