Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible note receivable	$ 6,775
Non-convertible note receivable	2,800
Long-term interest rate swap liability	253
Total	9,828
Long-term interest rate swap asset		599
Significant Other Observable Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term interest rate swap liability	253
Total	253
Long-term interest rate swap asset		599
Significant Unobservable Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible note receivable	6,775
Non-convertible note receivable	2,800
Total	$ 9,575