Related-Party Transactions - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended					0 Months Ended					3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2014 Blackstone and Affiliates [Member]	Jan. 03, 2014 Blackstone and Affiliates [Member]	Sep. 30, 2013 Blackstone and Affiliates [Member]	Jun. 30, 2013 Blackstone and Affiliates [Member]	Apr. 24, 2013 Blackstone and Affiliates [Member]	Mar. 31, 2014 Blackstone and Affiliates [Member]	Jun. 30, 2013 Blackstone and Affiliates [Member]	Mar. 31, 2013 Blackstone and Affiliates [Member]
Related Party Transaction [Line Items]
Advisory Agreement, fees											$ 0		$ 925
Termination fee paid										46,300
Write-off of 2013 prepaid advisory fee										3,772
Termination of advisory agreement												50,072
Cash dividend declared	$ 0.20	$ 0.20	$ 0.20	$ 0.20
Cash dividends declare date	2014-03	2013-12	2013-09	2013-06
Cash dividends record date	Mar. 20, 2014	Dec. 20, 2013	Sep. 20, 2013	Jun. 20, 2013
Cash dividend	Apr. 01, 2014	Jan. 03, 2014	Oct. 01, 2013	Jul. 01, 2013
Dividend declared to stockholders	$ 17,691				$ 184	$ 7,849	$ 7,849	$ 11,749	$ 11,749