Consolidated Subsidiaries - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 28, 2013	Dec. 31, 2012
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outstanding borrowings and accrued interest		$ 1,044	$ 2,603
Preferred stock value, per share	$ 0.01	$ 0.01
Preferred stock issued and sold	0	0
Proceeds from issuance of preferred stock after deducting issuance costs	$ 2,083
Total assets of consolidated subsidiaries	234,880	$ 158,506
Total liabilities of consolidated subsidiaries	418,569	260,577
Silver Creek Series B Preferred Stock [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Non-controlling interest increased	$ 1,188
Silver Creek [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Acquisition date	Aug. 20, 2010
Non-controlling interest increased		$ 400	$ 800
Ownership interest (as a percent)		60.00%	64.00%		74.00%
Total assets of consolidated subsidiaries	$ 800	$ 300
Total liabilities of consolidated subsidiaries	200	200
Unrestricted cash and cash equivalents balance	$ 700	300
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		$ 1,000	$ 600	$ 300	$ 1,600
Outstanding borrowings and accrued interest			$ 2,600
Silver Creek [Member] | Silver Creek Series B Preferred Stock [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred stock value, per share	$ 1.35
Non-controlling interest increased	$ 900
Preferred stock issued and sold	1,600
Silver Creek [Member] | Series A and B Preferred Stock [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership interest (as a percent)	56.00%	60.00%
Non-controlling interest	$ 200	$ 100
Silver Creek [Member] | Series A Preferred Stock [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred stock value, per share		$ 1.00	$ 1.00