Debt - Components of Long-term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 507,429
Short-term debt	7,429
Long-term debt	500,000	379,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt		79,000
5.25% Senior Notes due March 15, 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	500,000
8.625% Senior Notes due October 15, 2018 [Member]
Debt Instrument [Line Items]
Short-term debt	7,429
Long-term debt		$ 300,000