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Organization and Basis of Presentation - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2014
May 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Separation [Member]
Basis Of Presentation And Organization [Line Items]        
Spin-off description       In accordance with a separation and distribution agreement, the two companies were separated by NOV distributing to its stockholders all 107,053,031 shares of common stock of the Company after the market closed on May 30, 2014. Each NOV stockholder received one share of NOW common stock for every four shares of NOV common stock held at the close of business on the record date of May 22, 2014.
Common stock, shares outstanding 107,057,698 107,053,031 107,057,698 107,053,031
Ratio of common stock sharing       4