Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 383,921	$ 353,971
Less: current portion of long-term debt	30,072	67
Long-term debt, net of current maturities	353,849	353,904
2021 Notes
Debt Instrument [Line Items]
Long-term debt	350,000	350,000
Other Long-Term Debt
Debt Instrument [Line Items]
Long-term debt	3,921	3,971
2013 Facility
Debt Instrument [Line Items]
Long-term debt	$ 30,000