Organization and Basis of Presentation - Schedule of Adjustments to Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income (loss) from operations before income taxes	$ 45,500	$ 29,204	$ 74,251	$ 48,594
Consolidated net income (loss)	28,953	18,656	51,045	33,206	$ 128,008
Net income (loss) attributable to noncontrolling interest in subsidiaries	7,185	4,189	11,062	6,234
Net income (loss) available to common stockholders	$ 21,768	$ 14,467	$ 39,983	$ 26,972
Basic earnings (loss) per share	$ 0.08	$ 0.05	$ 0.14	$ 0.10
Diluted earnings (loss) per share	$ 0.07	$ 0.05	$ 0.14	$ 0.10
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income (loss) from operations before income taxes		$ 31,111		$ 52,242
Consolidated net income (loss)		20,563		36,854
Net income (loss) attributable to noncontrolling interest in subsidiaries		4,838		7,470
Net income (loss) available to common stockholders		$ 15,725		$ 29,384
Basic earnings (loss) per share		$ 0.06		$ 0.11
Diluted earnings (loss) per share		$ 0.06		$ 0.11
Retrospective Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income (loss) from operations before income taxes		$ (1,907)		$ (3,648)
Consolidated net income (loss)		(1,907)		(3,648)
Net income (loss) attributable to noncontrolling interest in subsidiaries		(649)		(1,236)
Net income (loss) available to common stockholders		$ (1,258)		$ (2,412)
Basic earnings (loss) per share		$ (0.01)		$ (0.01)
Diluted earnings (loss) per share		$ (0.01)		$ (0.01)