Noncontrolling Interest - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2013 Preferred Stock Series C [Member]	Jan. 31, 2013 Preferred Stock Series B [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred stock issued	$ 2.8	$ 7.9
Dividends rate	5.30%	5.30%
Voting rights	The preferred stock has no voting rights	The preferred stock has no voting rights