Acquisitions - Redeemable Noncontrolling Interest (Details) (USD $)	3 Months Ended								12 Months Ended			10 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Feb. 23, 2012
Redeemable Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interest	$ 0	$ 0	$ 0	$ 810,000	$ 1,430,000	$ 1,320,000	$ 910,000	$ 860,000	$ 810,000	$ 4,520,000	$ 2,410,000
Noncontrolling Interest, Change in Redemption Value										(890,000)
Redeemable noncontrolling interest, ending balance	0				29,480,000				0	29,480,000
Fair Value, Inputs, Level 3 [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Fair Value													25,630,000
Redeemable noncontrolling interest, ending balance	29,710,000				29,480,000				29,710,000	29,480,000	26,780,000	26,780,000
Business Acquisition, Arminak & Associates [Member]
Redeemable Noncontrolling Interest [Line Items]
Payments to Acquire Business Three, Net of Cash Acquired				51,000,000
Distributions to noncontrolling interests									(580,000)	(2,710,000)		(1,260,000)
Net income attributable to noncontrolling interest									810,000	4,520,000		2,410,000
Noncontrolling Interest, Change in Redemption Value										890,000
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High				7,000,000
Business Combination, Contingent Consideration, Liability	$ 1,100,000								$ 1,100,000