Consolidated Subsidiaries - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 28, 2013	Dec. 31, 2012
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Aggregate principal amounts	$ 125,000,000
Outstanding borrowings and accrued interest	2,603,000
Non-controlling interest	337,000		97,000
Total assets of consolidated subsidiaries	192,417,000		148,974,000
Total liabilities of consolidated subsidiaries	235,545,000		155,394,000
Silver Creek [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Non-controlling interest increased	800,000
Ownership interest (as a percent)	64.00%		74.00%
Non-controlling interest	337,000		97,000
Total assets of consolidated subsidiaries	1,000,000		2,200,000
Total liabilities of consolidated subsidiaries	100,000		1,800,000
Silver Creek [Member] | Silver Creek Convertible Note [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Aggregate principal amounts	600,000	300,000	1,600,000
Outstanding borrowings and accrued interest	2,600,000
Preferred stock value, per share	$ 1.00
Silver Creek [Member] | Series A Preferred Stock [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Shares owned by employees and directors of the parent company (as a percent)	7.00%		6.00%