Restated Consolidated Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net loss	$ (200,821)	[1]	$ (80,400)	[1]	$ (69,836)	[1]	$ (144,073)	[1]	$ (16,868)	[2]	$ (12,949)	[2]	$ (7,159)	[2]	$ (5,044)	[2]	$ (507,815)	[3],[4],[5]	$ (42,237)	[3]	$ (4,804)
Other comprehensive income (loss):
Designated derivatives, fair value adjustments																	11,481	[3],[4]	(3,743)	[3]	(98)
Change in unrealized gain/loss on investment securities																	119	[3],[4],[6]	(93)	[3]	0
Total other comprehensive income (loss)																	11,600	[3],[4],[7]	(3,836)	[3]	(98)
Total comprehensive loss																	(496,215)	[3],[4],[8]	(46,073)	[3]	(4,902)
Comprehensive loss attributable to non-controlling interests																	16,316	[3],[4]	585	[3]	105
Total comprehensive loss attributable to stockholders																	(479,899)	[3],[4]	(45,488)	[3]	(4,797)
As Previously Reported [Member]
Net loss	(181,948)	[1]	(82,876)	[1]	(72,191)	[1]	(141,356)	[9]	(17,152)	[9]							(480,456)	[10],[4],[5]
Other comprehensive income (loss):
Designated derivatives, fair value adjustments																	11,480	[10],[4]
Change in unrealized gain/loss on investment securities																	119	[10],[4],[6]
Total other comprehensive income (loss)																	11,599	[10],[4],[7]
Total comprehensive loss																	(468,857)	[10],[4],[8]
Comprehensive loss attributable to non-controlling interests																	5,716	[10],[4]
Total comprehensive loss attributable to stockholders																	(463,141)	[10],[4]
Error Corrections [Member]
Net loss	(18,873)		2,476	[11]	2,355	[12]	(2,717)	[12]	284	[13]							(27,359)	[4],[5]
Other comprehensive income (loss):
Designated derivatives, fair value adjustments																	1	[4]
Change in unrealized gain/loss on investment securities																	0	[4],[6]
Total other comprehensive income (loss)																	1	[4],[7]
Total comprehensive loss																	(27,358)	[4],[8]
Comprehensive loss attributable to non-controlling interests																	10,600	[4]
Total comprehensive loss attributable to stockholders																	$ (16,758)	[4]

[1] The historical financial statements have been adjusted for discontinued operations and figures have been recast in applying the carryover basis of accounting to include the effects of the merger with ARCT IV.

[2] Certain historical balances have been restated for discontinued operations.

[3] For discussion on the restatement adjustments, see Note 2 - Restatement of Previously Issued Financial Statements.

[4] The statement of comprehensive loss was originally included within the consolidated statement of operations in the recasted filing, which applied the carryover basis of accounting to include the effects of the merger with ARCT IV; it is now presented as a standalone financial statement.

[5] The statement of comprehensive loss previously began with net loss attributable to common stockholders . The statement has been updated to begin with net loss to properly show the total comprehensive loss.

[6] This line item has been updated to unrealized gain (loss) on investment securities in the accompanying statements of comprehensive loss.

[7] The total other comprehensive income (loss) line item has been added and included in the accompanying statements of comprehensive loss.

[8] This line item caption has been updated to total comprehensive loss in the accompanying statements of comprehensive loss.

[9] These financial figures have been recast in applying the carryover basis of accounting to include the effects of the merger with ARCT IV.

[10] These financial statements have been recast in applying the carryover basis of accounting to include the effects of the merger with ARCT IV.

[11] See Note 2 - Restatement of Previously Issued Financial Statements in the Company's Quarterly Report on Form 10-Q for the fiscal period ended September 30, 2014 for further discussion on the restatement adjustments.

[12] See Note 2 - Restatement of Previously Issued Financial Statements in the Company's Quarterly Reports on Forms 10-Q/A for the fiscal periods ended March 31, 2014 and June 30, 2014, respectively, for further discussion on the restatement adjustments.

[13] See Note 2 - Restatement of Previously Issued Financial Statements.