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Long-Term Debt - Schedule of Long-Term Debt Interest Rate (Detail)
12 Months Ended
Dec. 31, 2013
Less than .25 to 1 [Member] | Maximum [Member]
 
Debt Instrument [Line Items]  
Ratio of Total Outstanding Borrowings to Borrowing Base 0.25
Greater than or equal to .25 to 1 but less than .50 to 1 [Member] | Maximum [Member]
 
Debt Instrument [Line Items]  
Ratio of Total Outstanding Borrowings to Borrowing Base 0.50
Greater than or equal to .25 to 1 but less than .50 to 1 [Member] | Minimum [Member]
 
Debt Instrument [Line Items]  
Ratio of Total Outstanding Borrowings to Borrowing Base 0.25
Greater than or equal to .50 to 1 but less than .75 to 1 [Member] | Maximum [Member]
 
Debt Instrument [Line Items]  
Ratio of Total Outstanding Borrowings to Borrowing Base 0.75
Greater than or equal to .50 to 1 but less than .75 to 1 [Member] | Minimum [Member]
 
Debt Instrument [Line Items]  
Ratio of Total Outstanding Borrowings to Borrowing Base 0.50
Greater than or equal to .75 to 1 but less than .90 to 1 [Member] | Maximum [Member]
 
Debt Instrument [Line Items]  
Ratio of Total Outstanding Borrowings to Borrowing Base 0.90
Greater than or equal to .75 to 1 but less than .90 to 1 [Member] | Minimum [Member]
 
Debt Instrument [Line Items]  
Ratio of Total Outstanding Borrowings to Borrowing Base 0.75
Greater than .90 to 1 but less than or equal 1 [Member] | Minimum [Member]
 
Debt Instrument [Line Items]  
Ratio of Total Outstanding Borrowings to Borrowing Base 0.90
LIBOR [Member] | Less than .25 to 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 1.50%
LIBOR [Member] | Greater than or equal to .25 to 1 but less than .50 to 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 1.75%
LIBOR [Member] | Greater than or equal to .50 to 1 but less than .75 to 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 2.00%
LIBOR [Member] | Greater than or equal to .75 to 1 but less than .90 to 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 2.25%
LIBOR [Member] | Greater than .90 to 1 but less than or equal 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 2.50%
ABR [Member] | Less than .25 to 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 0.00%
ABR [Member] | Greater than or equal to .25 to 1 but less than .50 to 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 0.25%
ABR [Member] | Greater than or equal to .50 to 1 but less than .75 to 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 0.50%
ABR [Member] | Greater than or equal to .75 to 1 but less than .90 to 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 0.75%
ABR [Member] | Greater than .90 to 1 but less than or equal 1 [Member]
 
Debt Instrument [Line Items]  
Debt instrument interest rate terms, in percentage 1.00%