Debt and Financing Arrangements - Summary of Reconciliation of Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Senior Notes under a Master Shelf Agreement, described below	$ 14,286	$ 14,286
Capital Leases, described below	48,793	40,152
Total debt	116,439	68,972
Less: current portion of long-term debt	13,659	12,432
Long-term debt, less current portion	102,780	56,540
Credit Agreement with Banks [Member]
Debt Instrument [Line Items]
Credit Agreement with Banks, described below	$ 53,360	$ 14,534

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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