Summary of Selected Financial Information of the Company on a Pro Forma Basis (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition Pro Forma Information [Abstract]
Revenues	$ 631,770	$ 332,027	$ 1,126,914	$ 756,327
Net loss	$ (85,184)	$ (133,530)	$ (117,317)	$ (229,295)
Loss per share	$ (0.40)	$ (0.63)	$ (0.56)	$ (1.09)

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration