Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Oct. 06, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows From Operating Activities
Net income (loss)	$ 193,431		$ 48,643	$ 57,397
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	27,375
Amortization of deferred finance costs and debt premiums	152		4,900	3,200
Amortization of acquired above and below-market leases, net	(1,911)		0	0
Amortization of acquired below-market ground lease	426
Straight-lining of rental revenue	(8,932)
Bad debts (recoveries)	149
Equity based compensation	2,994
Gain on consolidation of non-controlled entities	(322,563)
Equity in net income of non-controlled entities	0	(14,875)	(14,348)	(3,893)
Distributions of cumulative earnings of non-controlled entities	0		10,095
Deemed contribution for settlement expense	0
Increase (decrease) in cash flows due to changes in operating assets and liabilities (excluding the effect of acquisitions):
Restricted cash	7,196
Tenant and other receivables	(7,590)
Deferred leasing costs	(8,916)
Due to/from affiliated companies, net	2,368
Prepaid expenses and other assets	(15,120)
Accounts payable and accrued expenses	9,140
Accrued interest payable	260
Deferred revenue and other liabilities	(10,386)
Net cash provided by (used in) operating activities	(131,927)
Cash Flows From Investing Activities
Cash paid in the formation transactions to acquire the non-controlled properties, net of cash received	(563,529)
Decrease (increase) in restricted cash for investing activities	(344)
Development costs	0
Increase in due from affiliates for advances for leasehold interests and improvements	0
Additions to building and improvements and building leasehold interests	(56,434)
Net cash used in investing activities	(620,307)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	0
Repayment of mortgage notes payable	(313,240)
Proceeds from unsecured loan payable	0
Repayment of unsecured notes payable	(7,350)
Proceeds from term loan and credit facility	335,000
Repayments of term loan and credit facility	(10,000)
Deferred financing costs	(15,381)
Net proceeds from the sale of common stock	992,887
Deferred offering costs	0
Contributions from owners	0
Cash paid for equity interests in the formation transactions	(143,236)
Distributions to Predecessor owners	(123,147)
Dividends paid to common stockholders	(7,601)
Distributions paid to noncontrolling interests in the operating partnership	(11,915)
Net cash provided by (used in) financing activities	696,017
Net increase (decrease) in cash and cash equivalents	(56,217)
Cash and cash equivalents—beginning of period	116,960
Cash and cash equivalents—end of period	60,743	116,960
Supplemental disclosures of cash flow information:
Cash paid for interest	12,648
Cash paid for income taxes	329
Non-cash investing and financing activities:
Commercial real estate properties included in accounts payable and accrued expenses	15,584
Issuance of Class A Common Stock, Class B Common Stock, and operating partnership units in connection with the acquisition of real estate properties	457,493
Debt assumed with the acquisition of real estate properties	136,226
Reduction of equity for deferred offering costs	32,319
Acquisition of working capital, net of cash	6,061
Due to affiliates settled in Class A Common Stock, Class B Common Stock, or operating partnership units	4,299
Accrued distributions to Predecessor owners	0
Distribution of real property to owners prior to the formation transactions	0
Distribution of unsecured loan and note payable - related party to owners prior to the formation transactions	0
Predecessor [Member]
Cash Flows From Operating Activities
Net income (loss)		(37,232)	48,643	57,397
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization		38,963	42,690	35,513
Amortization of deferred finance costs and debt premiums		11,512	4,881	3,247
Amortization of acquired above and below-market leases, net		0	0	0
Amortization of acquired below-market ground lease		0	0	0
Straight-lining of rental revenue		(3,383)	(2,568)	(3,116)
Bad debts (recoveries)		(597)	498	1,226
Equity based compensation		0	0	0
Gain on consolidation of non-controlled entities		0	0	0
Equity in net income of non-controlled entities		(14,875)	(14,348)	(3,893)
Distributions of cumulative earnings of non-controlled entities		3,391	10,095	13,011
Deemed contribution for settlement expense		55,000	0	0
Increase (decrease) in cash flows due to changes in operating assets and liabilities (excluding the effect of acquisitions):
Restricted cash		(633)	4,392	4,202
Tenant and other receivables		(80)	4,484	(6,057)
Deferred leasing costs		(9,771)	(14,654)	(15,026)
Due to/from affiliated companies, net		26,901	7,472	(37,074)
Prepaid expenses and other assets		3,084	(1,154)	485
Accounts payable and accrued expenses		326	1,893	(265)
Accrued interest payable		(149)	520	(305)
Deferred revenue and other liabilities		924	1,509	(1,663)
Net cash provided by (used in) operating activities		73,381	94,353	47,682
Cash Flows From Investing Activities
Cash paid in the formation transactions to acquire the non-controlled properties, net of cash received		0	0	0
Decrease (increase) in restricted cash for investing activities		(500)	(5,561)	55
Development costs		179	(189)	(49)
Increase in due from affiliates for advances for leasehold interests and improvements		0	(15,061)	0
Additions to building and improvements and building leasehold interests		(56,129)	(87,470)	(60,533)
Net cash used in investing activities		(56,450)	(108,281)	(60,527)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable		102,947	69,000	170,540
Repayment of mortgage notes payable		(20,049)	(12,212)	(102,354)
Proceeds from unsecured loan payable		3,750	51	5,600
Repayment of unsecured notes payable		0	0	(3,200)
Proceeds from term loan and credit facility		0	0	0
Repayments of term loan and credit facility		0	0	0
Deferred financing costs		(3,482)	(4,339)	(7,438)
Net proceeds from the sale of common stock		0	0	0
Deferred offering costs		(6,595)	(12,593)	(7,480)
Contributions from owners		3,924	2,107	2,153
Cash paid for equity interests in the formation transactions		0	0	0
Distributions to Predecessor owners		(31,965)	(62,903)	(46,691)
Dividends paid to common stockholders		0	0	0
Distributions paid to noncontrolling interests in the operating partnership		0	0	0
Net cash provided by (used in) financing activities		48,530	(20,889)	11,130
Net increase (decrease) in cash and cash equivalents		65,461	(34,817)	(1,715)
Cash and cash equivalents—beginning of period		51,499	86,316	88,031
Cash and cash equivalents—end of period		116,960	51,499	86,316
Supplemental disclosures of cash flow information:
Cash paid for interest		38,380	48,993	51,776
Cash paid for income taxes		0	0	0
Non-cash investing and financing activities:
Commercial real estate properties included in accounts payable and accrued expenses		1,812	1,926	518
Issuance of Class A Common Stock, Class B Common Stock, and operating partnership units in connection with the acquisition of real estate properties		0	0	0
Debt assumed with the acquisition of real estate properties		0	0	0
Reduction of equity for deferred offering costs		0	0	0
Acquisition of working capital, net of cash		0	0	0
Due to affiliates settled in Class A Common Stock, Class B Common Stock, or operating partnership units		0	0	0
Accrued distributions to Predecessor owners		123,147	0	0
Distribution of real property to owners prior to the formation transactions		16,345	0	0
Distribution of unsecured loan and note payable - related party to owners prior to the formation transactions		$ 14,739	$ 0	$ 0