Contingencies - Additional Information (Detail) (USD $)	0 Months Ended		12 Months Ended	1 Months Ended
	Oct. 29, 2012	Jun. 06, 2012	Dec. 31, 2014	Sep. 30, 2012	Jul. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Jul. 10, 2012
Commitment And Contingencies [Line Items]
Amount of fine paid	$ 7,800,000
Amount approved to be paid under the agreement		34,200,000
Interest rate on settlement amount approved to be paid under the agreement (as a percent)		3.00%
Settlement agreement description			The Company agreed to pay $34.2 million (plus interest at a rate of 3% from May 5, 2011 through the day before payment was made)
Mandatory special assessment	400
Amount paid to settlement of claims	32,000,000		1,300,000
Amount used from escrow fund through acquisition of Blackstone for legal settlement	32,000,000
Judgments and settlement costs			3,800,000			6,700,000	6,800,000
Discontinued operations for compensatory damages and exemplary damages					5,700,000
Litigation Related To Promeca
Commitment And Contingencies [Line Items]
Loss contingency accrued amount								5,200,000
Accrued amount of fine								2,200,000
Loss contingency paid				5,200,000
Amount of fine paid					$ 2,200,000
Deferred prosecution agreement term					3 years