Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.8.0.1
Stockholders' Equity - Additional Information (Detail)
$ in Thousands, shares in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
shares
Jan. 31, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Jun. 30, 2017
shares
Mar. 31, 2017
shares
Class of Stock [Line Items]            
Option to purchase additional shares of common stock 10.0          
Aggregate purchase price, net of offering costs | $ $ 94,800          
Fees and commissions | $ $ 5,200   $ 5,707 $ 1,681    
Conversion ratio     1      
Treasury shares retired 1.3          
Over-allotment Option            
Class of Stock [Line Items]            
Option to purchase additional shares of common stock 1.5          
At-the-Market Program            
Class of Stock [Line Items]            
Option to purchase additional shares of common stock     1.0      
Aggregate purchase price, net of offering costs | $     $ 10,300      
Fees and commissions | $     500      
TOTAL Delaware Inc            
Class of Stock [Line Items]            
Option to purchase additional shares of common stock   35.4        
Aggregate purchase price, net of offering costs | $   $ 207,000        
Shares exchanged for issue of common stock   46.0        
GE Oil & Gas, Inc.            
Class of Stock [Line Items]            
Number of shares converted         5.5  
GE Oil & Gas, Inc. | Series A Preferred Stock            
Class of Stock [Line Items]            
Number of shares converted           5.5
GE Oil & Gas, Inc. | Series B Preferred Stock            
Class of Stock [Line Items]            
Number of shares converted         5.5  
Maximum | At-the-Market Program            
Class of Stock [Line Items]            
Aggregate purchase price, net of offering costs | $     $ 200,000