Summary of Significant Accounting Principles - Summary of Effects of Revision in Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Accounts payable and accrued expenses	$ (8,255)	$ 148
Net cash provided by operating activities	7,335	3,516
Cash flows from investing activities, net of acquisition:
Capital expenditures	(22,818)	(31,677)
Net cash used in investing activities	$ (33,226)	(59,702)
As Previously Reported [Member]
Cash flows from operating activities:
Accounts payable and accrued expenses		(1,990)
Net cash provided by operating activities		1,378
Cash flows from investing activities, net of acquisition:
Capital expenditures		(29,539)
Net cash used in investing activities		$ (57,564)